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These are the user uploaded subtitles that are being translated: 1 00:00:04,705 --> 00:00:07,106 The injuries were very catastrophic. 2 00:00:07,108 --> 00:00:10,409 It was one of the more violent beatings that I think I've ever seen. 3 00:00:12,279 --> 00:00:14,346 He was in the wrong place at the wrong time. 4 00:00:20,854 --> 00:00:25,257 They had no enemies whatsoever, so why did this happen? 5 00:00:29,929 --> 00:00:34,400 Would a daughter commit murder in order to achieve financial gain? 6 00:00:35,769 --> 00:00:38,504 He admitted that they had not always been close. 7 00:00:39,639 --> 00:00:42,875 Just the need to survive the addiction 8 00:00:42,877 --> 00:00:45,544 can motivate extremely dangerous behavior, 9 00:00:46,212 --> 00:00:47,513 including murder. 10 00:00:49,916 --> 00:00:52,184 You hold out the hope that it's gonna be the, 11 00:00:52,186 --> 00:00:54,353 the quote-unquote "smoking gun of the case." 12 00:00:57,057 --> 00:00:58,590 Everyday in North America 13 00:00:58,592 --> 00:01:01,427 dozens of people are murdered. 14 00:01:01,429 --> 00:01:03,762 The key to solving the toughest of these homicides 15 00:01:03,764 --> 00:01:07,866 lies in the final 24 hours of the victim's life. 16 00:01:07,868 --> 00:01:13,305 To crack the case detectives must reconstruct that critical timeline. 17 00:01:13,307 --> 00:01:16,141 The minutes and hours containing evidence 18 00:01:16,143 --> 00:01:18,143 that can help unlock the mystery 19 00:01:18,145 --> 00:01:19,645 and catch the killer. 20 00:01:30,090 --> 00:01:32,191 Springfield, Missouri, 21 00:01:32,193 --> 00:01:36,895 a city where residents are know for enjoying the simple pleasures of life, 22 00:01:36,897 --> 00:01:41,567 from small-town hospitality to the great outdoors. 23 00:01:42,902 --> 00:01:46,305 Springfield is in the heart of the Ozarks 24 00:01:47,173 --> 00:01:50,576 We are surrounded by lakes and forest, 25 00:01:50,578 --> 00:01:51,810 so it's very good if you're into outdoors. 26 00:01:51,812 --> 00:01:54,012 It's good, good area for that. 27 00:01:54,014 --> 00:01:58,083 It's kind of a bigger city with a small town feel. 28 00:01:59,519 --> 00:02:01,320 If you move into a new neighborhood 29 00:02:01,322 --> 00:02:05,657 people will bring cookies and brownies and breads, things like that. 30 00:02:05,659 --> 00:02:08,193 It's a very warm and inviting place. 31 00:02:08,928 --> 00:02:12,197 But as the sun rises on another beautiful day 32 00:02:12,199 --> 00:02:15,434 it appears two Springfield residents have gone missing. 33 00:02:18,139 --> 00:02:21,373 On my way to work I tried to call my mom 34 00:02:21,375 --> 00:02:23,175 and I did not reach her. 35 00:02:25,779 --> 00:02:28,013 I thought maybe she was in the garden 36 00:02:28,781 --> 00:02:31,116 so I tried again a little bit later 37 00:02:31,751 --> 00:02:34,019 and I still did not reach her. 38 00:02:34,021 --> 00:02:37,156 My parents had a very strict routine 39 00:02:37,158 --> 00:02:40,425 and I just felt like something wasn't right. 40 00:02:41,761 --> 00:02:43,328 Her concern mounting, 41 00:02:44,097 --> 00:02:46,165 Jessica and her fiancé Jason 42 00:02:46,167 --> 00:02:48,867 rush from their home in Oklahoma city 43 00:02:48,869 --> 00:02:50,969 to her parents' house in Springfield 44 00:02:50,971 --> 00:02:52,271 five hours away. 45 00:02:53,039 --> 00:02:55,941 We did that drive in about four hours that day. 46 00:02:55,943 --> 00:02:59,011 Um, arriving at the house approximately seven o'clock. 47 00:03:02,649 --> 00:03:04,516 I hit that garage door button 48 00:03:08,388 --> 00:03:10,589 and both of their cars were in the garage. 49 00:03:13,059 --> 00:03:17,829 I think my stomach just completely fell. 50 00:03:17,831 --> 00:03:19,097 I knew something was very wrong 51 00:03:19,099 --> 00:03:21,366 at that point in time. 52 00:03:21,368 --> 00:03:25,237 Soon after arriving Jessica is calling 911. 53 00:03:31,045 --> 00:03:34,446 When officers arrive, they go in and check the home. 54 00:03:36,950 --> 00:03:39,985 And upon entering the home, immediately discovered 55 00:03:39,987 --> 00:03:43,055 a male body upstairs in a hallway 56 00:03:44,190 --> 00:03:46,091 They continued to search the residence 57 00:03:46,093 --> 00:03:48,994 and in the basement of the home, in the office area 58 00:03:49,662 --> 00:03:52,297 they also discovered another body. 59 00:03:55,902 --> 00:03:59,771 The victims are identified as husband and wife of 30 year, 60 00:03:59,773 --> 00:04:01,406 Gary and Jan Tyrrell. 61 00:04:04,143 --> 00:04:06,111 My dad was a lifelong educator. 62 00:04:06,412 --> 00:04:09,214 Um, he... 63 00:04:10,049 --> 00:04:12,251 um, taught school. 64 00:04:12,919 --> 00:04:15,254 He was a big teddy bear of a man. 65 00:04:15,256 --> 00:04:19,725 He loved helping children, helping others 66 00:04:19,727 --> 00:04:22,127 and my mom did as well. 67 00:04:22,129 --> 00:04:24,630 Um, they both were huge givers. 68 00:04:25,231 --> 00:04:29,334 My mom also had a big heart. 69 00:04:29,336 --> 00:04:32,004 She loved to sew and crafts. 70 00:04:33,106 --> 00:04:36,642 She knit little hats to make sure that 71 00:04:36,644 --> 00:04:39,144 the cancer patients didn't get cold. 72 00:04:40,980 --> 00:04:44,383 My parents were both very loving and kind people. 73 00:04:47,120 --> 00:04:48,553 Tasked with investigating 74 00:04:48,555 --> 00:04:52,224 the brutal double homicide of Gary and Jan Tyrrell 75 00:04:52,226 --> 00:04:56,128 is detective Neal McAmis of the Springfield Police Department. 76 00:04:58,998 --> 00:05:00,832 Gary had a lot of blood 77 00:05:00,834 --> 00:05:03,201 about his head and shoulder area 78 00:05:03,670 --> 00:05:06,104 with multiple gunshot wounds. 79 00:05:07,807 --> 00:05:11,209 But there was nothing immediately within the areas of the body 80 00:05:11,211 --> 00:05:14,012 that would indicate that the murder weapon was left on scene. 81 00:05:18,251 --> 00:05:24,222 We also noticed there were some kind of weird flakes of some kind on the ground. 82 00:05:27,827 --> 00:05:30,062 We didn't know what they were at that point. 83 00:05:32,765 --> 00:05:35,434 With the position of Gary's body, 84 00:05:35,436 --> 00:05:38,036 it was almost as if he was in a struggle with the suspect 85 00:05:38,038 --> 00:05:39,004 trying to get away. 86 00:05:39,006 --> 00:05:41,039 As if the suspect was grasping at him 87 00:05:41,041 --> 00:05:43,375 and pulling at him to try to get him to come back 88 00:05:50,216 --> 00:05:53,018 Jan had a very traumatic injury 89 00:05:53,020 --> 00:05:54,553 to the back of her head. 90 00:05:56,322 --> 00:05:58,990 And in my career was one of the more violent beatings 91 00:05:58,992 --> 00:06:01,093 that I think I'd ever seen. 92 00:06:01,794 --> 00:06:03,962 We did not know at that point 93 00:06:03,964 --> 00:06:05,630 what the cause of that injury was. 94 00:06:08,034 --> 00:06:09,968 But we did notice immediately 95 00:06:09,970 --> 00:06:14,473 there were some of the same white flakes around her body as well 96 00:06:15,775 --> 00:06:18,510 Jan's murder was really vicious, very violent. 97 00:06:21,247 --> 00:06:24,216 Almost as if it was a rage type killing. 98 00:06:25,718 --> 00:06:30,088 Gary having, what we believe, interrupted the crime. 99 00:06:32,158 --> 00:06:34,126 He was in the wrong place at the wrong time. 100 00:06:41,968 --> 00:06:45,036 In the middle of the living area of the basement 101 00:06:45,038 --> 00:06:46,371 was a latex glove. 102 00:06:47,440 --> 00:06:50,275 The Tyrrell home was extremely clean, 103 00:06:50,277 --> 00:06:52,277 very well kept and organized. 104 00:06:52,279 --> 00:06:55,614 So this latex glove was just totally out of place. 105 00:06:57,950 --> 00:06:59,951 But of course you hold out the hope that it's gonna be 106 00:06:59,953 --> 00:07:03,121 the quote-unquote "smoking gun of the case." 107 00:07:03,123 --> 00:07:06,291 And that gave us some hope that we'd be able to find DNA on the glove 108 00:07:06,293 --> 00:07:08,427 that could link us to the killer. 109 00:07:10,062 --> 00:07:12,898 But we really don't know if this was a planned event 110 00:07:12,900 --> 00:07:15,367 or if this was a crime of passion 111 00:07:15,369 --> 00:07:17,636 and we don't know if there's one killer, 112 00:07:17,638 --> 00:07:19,404 if we're dealing with multiple people. 113 00:07:19,406 --> 00:07:22,340 We're still trying to piece puzzle pieces together 114 00:07:22,342 --> 00:07:24,910 to figure out what we have going on. 115 00:07:24,912 --> 00:07:28,380 To solve the double homicide of Gary and Jan Tyrrell 116 00:07:28,382 --> 00:07:30,849 Detective McAmis will need to reconstruct 117 00:07:30,851 --> 00:07:33,518 the final 24 hours of their lives. 118 00:07:35,555 --> 00:07:38,089 At this point, we theorize the time of death. 119 00:07:38,091 --> 00:07:41,226 It had been at least a while because the blood had dried 120 00:07:41,228 --> 00:07:43,295 under both Gary and Jan. 121 00:07:43,297 --> 00:07:45,197 The blood was dried on scene. 122 00:07:46,933 --> 00:07:48,934 We believe the murders occurred 123 00:07:48,936 --> 00:07:53,638 sometime between 7:00 p.m. and 7:30 p.m. 124 00:07:54,340 --> 00:07:56,808 on the night of April 30th 125 00:07:56,810 --> 00:08:00,011 The wounds inflicted on the victims in this case 126 00:08:00,013 --> 00:08:05,617 tells me that this is not a well-executed or carefully executed crime. 127 00:08:05,619 --> 00:08:08,653 There is some kind of message being sent 128 00:08:08,655 --> 00:08:11,790 and, uh, that could be something internally expressive 129 00:08:11,792 --> 00:08:12,958 that only the killer would know 130 00:08:12,960 --> 00:08:15,760 but the brutality and the over kill 131 00:08:15,762 --> 00:08:19,231 suggests that there was something very personal about this. 132 00:08:22,301 --> 00:08:24,169 We're still looking for motive. 133 00:08:24,171 --> 00:08:26,738 Gary and Jan are a very beloved couple. 134 00:08:26,740 --> 00:08:29,407 So, why did this happen? Why-- What was going on? 135 00:08:30,643 --> 00:08:33,979 With more evidence required to solidify a theory 136 00:08:33,981 --> 00:08:36,715 Detective McAmis continues to search the house 137 00:08:36,717 --> 00:08:38,984 looking for clues to catch the killer. 138 00:08:40,186 --> 00:08:44,589 There was a large safe for Gary to keep his valuables. 139 00:08:46,325 --> 00:08:48,994 It was really odd because there were pry marks on it. 140 00:08:51,030 --> 00:08:53,131 Throughout the Tyrrell home, there's just 141 00:08:53,133 --> 00:08:56,368 numerous valuables and collectibles of all kinds 142 00:08:56,370 --> 00:09:00,171 from gold, jewelry, silver... 143 00:09:00,173 --> 00:09:02,941 It was obvious to us that the Tyrrells were worth a lot of money 144 00:09:02,943 --> 00:09:06,378 in terms of the collectibles and valuables that they had inside the home. 145 00:09:11,183 --> 00:09:15,153 We found a ledger or kind of an itemized list of coins, 146 00:09:15,155 --> 00:09:17,622 uh, that he was keeping track of 147 00:09:17,624 --> 00:09:21,226 that were worth $22,000 total. 148 00:09:21,994 --> 00:09:25,897 Gary was also a collector of guns. 149 00:09:25,899 --> 00:09:30,969 Maybe the suspect grabbed one of Gary's guns and killed Gary with it. 150 00:09:30,971 --> 00:09:33,672 Is robbery going to be our motive here? 151 00:09:33,674 --> 00:09:39,144 Does the killer know the valuables and how much these items are worth? 152 00:09:39,146 --> 00:09:42,080 But even with a possible robbery motive 153 00:09:42,082 --> 00:09:44,616 detectives find themselves with little evidence 154 00:09:44,618 --> 00:09:46,985 that could point toward their killer. 155 00:09:46,987 --> 00:09:49,487 There's no type of forced entry, 156 00:09:49,489 --> 00:09:51,590 there's no ransacking of the home 157 00:09:51,592 --> 00:09:56,695 and we have no idea if anything is missing at all at this point. 158 00:09:56,697 --> 00:10:01,967 The killer has to be someone that either, one, has access to the home 159 00:10:01,969 --> 00:10:07,038 or two, it's somebody that Jan would've let inside the home. 160 00:10:07,040 --> 00:10:10,075 Detectives turn their focus to the one person 161 00:10:10,077 --> 00:10:12,277 they know who could get inside, 162 00:10:12,279 --> 00:10:15,080 the Tyrrells' only child, Jessica. 163 00:10:17,216 --> 00:10:18,483 In any circumstance 164 00:10:18,485 --> 00:10:20,185 where you have a wealthy older couple 165 00:10:20,187 --> 00:10:24,222 who are murdered together, you naturally have to ask 166 00:10:24,224 --> 00:10:26,524 who would stand to benefit from this tragedy? 167 00:10:27,827 --> 00:10:31,029 And police didn't have to look too far in this case 168 00:10:31,031 --> 00:10:34,499 to see that their daughter stood to inherit everything. 169 00:10:42,975 --> 00:10:46,645 In the horrific double homicide of Gary and Jan Tyrrell, 170 00:10:46,647 --> 00:10:50,115 Detective McAmis has identified a person of interest. 171 00:10:51,651 --> 00:10:54,019 The couple's daughter, Jessica. 172 00:10:58,791 --> 00:11:00,558 The person who had the most to gain was me. 173 00:11:01,394 --> 00:11:05,230 And because I stood to inherit everything. 174 00:11:21,614 --> 00:11:26,885 Jessica said she last spoke with her mother at 3:20 p.m. on April 30th. 175 00:11:26,887 --> 00:11:30,021 After speaking with her mother she had a doctor's appointment 176 00:11:30,023 --> 00:11:34,325 and was at the doctor's appointment until about 5:00 p.m. 177 00:11:34,327 --> 00:11:36,061 After her doctor's appointment, 178 00:11:36,063 --> 00:11:38,930 she and Jason went to a Pizza Hut in Oklahoma city. 179 00:11:38,932 --> 00:11:43,702 They arrived around 6:00 p.m. and ate dinner there. 180 00:11:43,704 --> 00:11:47,272 And they arrived home at approximately 7:00 p.m. 181 00:11:50,109 --> 00:11:53,845 Jessica said that Gary was supposed to teach a class that night, 182 00:11:53,847 --> 00:11:57,182 from 5:30 p.m. until 9:00 p.m. 183 00:11:59,351 --> 00:12:00,885 And then she would commonly 184 00:12:00,887 --> 00:12:05,290 received a text message from her father wishing her, "Good night." 185 00:12:05,292 --> 00:12:10,528 But she did not received a text message from her father on the evening of April 30th. 186 00:12:12,099 --> 00:12:14,099 On the morning of May 1st, 187 00:12:14,101 --> 00:12:18,369 Jessica tried calling her mother at approximately 7:30 a.m. 188 00:12:23,242 --> 00:12:25,043 Her mother did not answer. 189 00:12:31,083 --> 00:12:34,686 She's so concerned about not being able to speak with her parents, 190 00:12:34,688 --> 00:12:38,523 that she wanted to come check on her parents to see what was going on. 191 00:12:43,763 --> 00:12:47,665 It was odd as to why just can't Jason did not go into the residence, 192 00:12:49,235 --> 00:12:51,269 was something more nefarious going on here 193 00:12:51,271 --> 00:12:54,873 that Jessica and Jason possibly knew that the bodies 194 00:12:54,875 --> 00:12:56,007 were gonna be in the home, 195 00:12:56,009 --> 00:12:58,343 that they had some kind of involvement. 196 00:13:01,647 --> 00:13:03,948 Detective McAmis shifts his focus 197 00:13:03,950 --> 00:13:07,051 to confront Jessica about a possible financial motive 198 00:13:07,053 --> 00:13:08,987 for her parents' murder. 199 00:13:10,222 --> 00:13:14,859 She's the sole benefactor and would stand to gain 200 00:13:14,861 --> 00:13:18,029 a large amount of money by the passing of her parents. 201 00:13:20,900 --> 00:13:23,568 Jessica said that she didn't need her parents' money, 202 00:13:23,570 --> 00:13:26,604 because if she wanted it that her parents would assist her and help her out, 203 00:13:26,606 --> 00:13:30,341 so she denied any type of financial motive in terms of, uh, 204 00:13:30,343 --> 00:13:31,976 wanting her parents dead. 205 00:13:33,547 --> 00:13:36,247 With Jessica's motive under the microscope, 206 00:13:36,249 --> 00:13:41,152 Detective McAmis moves on to interview her fiancé, Jason Murray. 207 00:13:41,987 --> 00:13:44,656 When I realized that we were both suspects. 208 00:13:44,658 --> 00:13:49,027 It was upsetting and it was also somewhat frightening. 209 00:13:50,196 --> 00:13:54,032 Jason tells us that he went to work the morning of April 30th, 210 00:13:54,034 --> 00:13:57,202 where he said he stayed until about 5:00 p.m. 211 00:13:58,204 --> 00:14:02,740 We went to a Pizza Hut and had dinner. 212 00:14:02,742 --> 00:14:04,709 And then returned home around 7:00 p.m. 213 00:14:04,711 --> 00:14:08,179 which was in line with, with what Jessica had said. 214 00:14:10,416 --> 00:14:14,185 We were able to confirmed through the surveillance footage at the Pizza Hut 215 00:14:14,187 --> 00:14:18,323 that there is no way that Jessica or Jason could have been in Springfield 216 00:14:18,325 --> 00:14:20,725 at the time of the murder. 217 00:14:20,727 --> 00:14:25,129 It was readily apparent that they were not the killers of Gary and Jan. 218 00:14:26,799 --> 00:14:29,100 Having established that Jessica and Jason 219 00:14:29,102 --> 00:14:33,004 did not have the opportunity to kill Gary and Jan Tyrrell, 220 00:14:33,006 --> 00:14:35,306 they are eliminated as suspects. 221 00:14:38,143 --> 00:14:40,445 I did have a little bit of relief. 222 00:14:43,182 --> 00:14:46,451 There was a lot of whispering that I could have been involved, 223 00:14:48,020 --> 00:14:51,089 and knowing that... 224 00:14:51,091 --> 00:14:56,361 you're a murder suspect does not, um, really sit well. 225 00:14:59,265 --> 00:15:01,733 Investigators turned their attention to Gary's brother, 226 00:15:01,735 --> 00:15:03,801 Larry Tyrrell. 227 00:15:03,803 --> 00:15:07,071 We want to talk to Larry because it was reported to us that, 228 00:15:07,073 --> 00:15:09,641 Gary and Larry were not always real close. 229 00:15:11,844 --> 00:15:15,079 Is there some kind of animosity there between them? 230 00:15:15,081 --> 00:15:17,982 We need to get Larry's story and information from him, 231 00:15:17,984 --> 00:15:20,451 to see if he is a possible suspect. 232 00:15:23,188 --> 00:15:27,659 Larry admitted that he and Gary had not always been close, 233 00:15:27,661 --> 00:15:31,062 but had gotten much tighter over, over time. 234 00:15:33,065 --> 00:15:35,500 Especially since the passing of their mother. 235 00:15:36,535 --> 00:15:39,203 Larry said the last time he spoke with Gary, 236 00:15:39,205 --> 00:15:43,207 Was about 7:00 p.m. on the evening of April 30th. 237 00:15:44,610 --> 00:15:46,311 Viewing call records, 238 00:15:46,313 --> 00:15:50,148 uh, on Gary's phone, it did show that Larry was being truthful 239 00:15:50,150 --> 00:15:53,751 that they had spoken at that time. 240 00:15:53,753 --> 00:15:58,856 Larry informed us he was in Mountain Grove on the evening of April 30th, 241 00:15:58,858 --> 00:16:01,826 which his wife later corroborated. 242 00:16:01,828 --> 00:16:05,029 Since Larry was an hour away in Mountain Grove. 243 00:16:05,031 --> 00:16:07,565 He did not have the opportunity to commit the murders, 244 00:16:07,567 --> 00:16:09,667 and is eliminated as as a suspect. 245 00:16:09,669 --> 00:16:14,005 Based on the seven o'clock conversation that Larry had with Gary, 246 00:16:14,007 --> 00:16:19,877 we believed that was the last known contact of, um, any kind with Gary. 247 00:16:19,879 --> 00:16:24,182 We know now that Gary had left class early, 248 00:16:24,184 --> 00:16:26,918 and that when he spoke with Larry at seven o'clock that, 249 00:16:26,920 --> 00:16:29,520 the murders occurred sometime after that. 250 00:16:31,056 --> 00:16:33,658 Detectives asked Larry if he knows anyone 251 00:16:33,660 --> 00:16:36,294 who might have wanted to harm Gary and Jan. 252 00:16:39,164 --> 00:16:42,934 Larry said Gary and Jan had no enemies whatsoever, 253 00:16:42,936 --> 00:16:46,971 and could not think of why anybody would want to harm them. 254 00:16:46,973 --> 00:16:50,541 He said the only motive he could think of would be financial. 255 00:16:51,710 --> 00:16:55,179 My dad was big on diversifying. 256 00:16:55,181 --> 00:16:58,116 He grew up poor, my mom grew up poor, 257 00:16:58,118 --> 00:17:01,953 and so making sure you don't put all of your eggs in one basket 258 00:17:01,955 --> 00:17:03,988 was very important to him. 259 00:17:05,024 --> 00:17:07,892 So, my dad bought and sold 260 00:17:07,894 --> 00:17:10,461 gold and silver and platinum, 261 00:17:10,463 --> 00:17:14,565 weird collectable things you might see in a museum. 262 00:17:15,701 --> 00:17:17,869 He was always looking for ways to make money 263 00:17:17,871 --> 00:17:21,005 and it didn't really matter, what, how he did it. 264 00:17:22,641 --> 00:17:24,976 Larry discussed some of the, 265 00:17:24,978 --> 00:17:27,612 dealings that Gary was involved in. 266 00:17:27,614 --> 00:17:30,014 In terms of the gold and silver trade. 267 00:17:33,018 --> 00:17:36,587 Gary would often times do deals with random people 268 00:17:36,589 --> 00:17:40,224 and he said he discussed with Gary the dangers of that. 269 00:17:44,029 --> 00:17:48,633 Based on Gary's dealings, it is a possible scenario that, 270 00:17:48,635 --> 00:17:51,602 he encountered someone that knew the valuables. 271 00:17:51,604 --> 00:17:53,037 Could it have been somebody that 272 00:17:53,039 --> 00:17:56,074 followed him home, could it have been somebody that had staked him out 273 00:17:56,076 --> 00:18:00,244 and potentially was going to burglarize the residence? 274 00:18:03,215 --> 00:18:05,917 In the double homicide of Gary and Jan Tyrrell, 275 00:18:05,919 --> 00:18:09,353 Detective McAmis is working a new theory. 276 00:18:09,355 --> 00:18:14,058 Could the killer be connected to Gary's side business of trading gold and silver? 277 00:18:15,994 --> 00:18:21,199 Larry notified us of a close business associate of Gary's. 278 00:18:21,201 --> 00:18:25,870 They would often conduct transactions together. 279 00:18:25,872 --> 00:18:30,641 Harold was not only a business associate, but also a close friend that Jan 280 00:18:30,643 --> 00:18:33,111 would've allowed access to their home. 281 00:18:33,879 --> 00:18:36,214 Harold knew how much Gary was worth 282 00:18:36,216 --> 00:18:39,951 and what Gary was in possession of at the residence. 283 00:18:41,120 --> 00:18:43,988 In Gary's phone records, we found that Gary placed a call 284 00:18:43,990 --> 00:18:45,123 to his business associate 285 00:18:45,125 --> 00:18:49,927 at 6:57 p.m. on April 30th. 286 00:18:49,929 --> 00:18:55,199 We were able to speak with Harold and he told us that he was in Mountain Grove 287 00:18:55,201 --> 00:19:00,972 at the time the incident occurred which later on proved to be true. 288 00:19:00,974 --> 00:19:04,609 We were able to eliminate him very quickly based on that. 289 00:19:07,980 --> 00:19:11,415 With Gary's friend and business associate ruled out. 290 00:19:11,417 --> 00:19:14,519 Detective McAmis finds himself running out of leads. 291 00:19:17,089 --> 00:19:21,225 We're trying to look at all angles to figure out exactly 292 00:19:21,227 --> 00:19:24,028 who would have the means and opportunity to commit this crime 293 00:19:24,030 --> 00:19:26,697 uh, it's a frustrating process 294 00:19:26,699 --> 00:19:28,933 having to go down the different avenues, 295 00:19:28,935 --> 00:19:31,969 but we have to check all the boxes and make sure 296 00:19:31,971 --> 00:19:33,638 that there is no stone left unturned. 297 00:19:37,176 --> 00:19:39,477 It's a very hard pill to swallow, 298 00:19:39,479 --> 00:19:41,879 even though you know and understand that law enforcement 299 00:19:41,881 --> 00:19:43,347 is doing their job. 300 00:19:43,349 --> 00:19:48,452 I really just wanted them to move on to actually, "Who did this?" 301 00:19:48,454 --> 00:19:51,222 I really had to put our faith in the justice system and that, 302 00:19:51,224 --> 00:19:54,025 the justice system would do us right. 303 00:19:56,128 --> 00:19:59,564 But then, Detective McAmis finally catches a break. 304 00:20:01,133 --> 00:20:06,170 The DNA from the latex glove showed to have male characteristics. 305 00:20:08,173 --> 00:20:11,475 So, we now know that we're dealing with a male suspect. 306 00:20:13,278 --> 00:20:16,380 But when checking the DNA from the glove, 307 00:20:17,015 --> 00:20:18,683 in the DNA database, 308 00:20:18,685 --> 00:20:20,084 there was no match. 309 00:20:27,226 --> 00:20:30,294 Detective McAmis goes back to the drawing board. 310 00:20:30,296 --> 00:20:33,531 Looking for any new clues that could lead to a male suspect, 311 00:20:33,533 --> 00:20:36,033 who had access to the Tyrrell home. 312 00:20:39,037 --> 00:20:44,909 When speaking with Larry about who had access to the Tyrrell home, 313 00:20:44,911 --> 00:20:50,948 he said, it was just a very select few people, a couple of close family members 314 00:20:50,950 --> 00:20:54,352 and he also said Gary's best friend Mark Porter. 315 00:20:59,858 --> 00:21:03,961 Mark was frequently visiting the Tyrrell residence, 316 00:21:03,963 --> 00:21:09,200 Mark would have had knowledge of the valuables that were inside the Tyrrell home. 317 00:21:10,369 --> 00:21:15,172 Gary was mentoring Mark with the gold and silver trade. 318 00:21:15,174 --> 00:21:19,677 My dad did not have a lot of close friends and so I really thought it was great 319 00:21:19,679 --> 00:21:22,313 that he had someone he could do things with. 320 00:21:23,982 --> 00:21:26,384 Detective McAmis invites Mark Porter 321 00:21:26,386 --> 00:21:28,653 down to the station for an interview. 322 00:21:40,666 --> 00:21:42,633 Okay. 323 00:21:42,635 --> 00:21:44,769 My first impression of Mark Porter was, 324 00:21:44,771 --> 00:21:48,272 he was obviously a very intelligent individual, 325 00:21:50,242 --> 00:21:53,611 but at the same time he was also extremely arrogant. 326 00:21:53,613 --> 00:21:56,247 Almost to the point of being pompous. 327 00:21:56,249 --> 00:21:58,149 Um, there was no doubt that he thought he was 328 00:21:58,151 --> 00:22:00,985 the smartest person in the room. 329 00:22:02,387 --> 00:22:06,057 Mark told us that he and Gary, um, met each other 330 00:22:06,059 --> 00:22:07,792 in the Mountain Grove school district 331 00:22:07,794 --> 00:22:11,128 where Mark was the superintendent of schools 332 00:22:11,130 --> 00:22:13,497 and Gary was his assistant. 333 00:22:17,135 --> 00:22:20,738 Mark's initial description of his relationship 334 00:22:20,740 --> 00:22:22,173 with Gary was very odd. 335 00:22:22,175 --> 00:22:26,010 He described him as just being more or less acquaintances. 336 00:22:27,245 --> 00:22:29,980 That was really disheartening 337 00:22:29,982 --> 00:22:32,850 because my dad definitely felt like, 338 00:22:32,852 --> 00:22:35,152 Mark was his best friend. 339 00:22:38,023 --> 00:22:40,324 When Mark kind of down played the relationship 340 00:22:40,326 --> 00:22:41,792 and put it off as just kind of 341 00:22:41,794 --> 00:22:45,596 being acquaintances, that was definitely a red flag and alarming to us. 342 00:22:47,733 --> 00:22:52,370 I think most people want to downplay their relationship to the victim, 343 00:22:52,372 --> 00:22:56,073 especially if they are in fact considered suspects. 344 00:22:57,342 --> 00:23:00,077 The belief or the idea that somehow you're throwing 345 00:23:00,079 --> 00:23:02,780 the investigators off the scent, 346 00:23:02,782 --> 00:23:06,117 um, it's something that I think a lot of people will utilize as a ploy 347 00:23:06,119 --> 00:23:09,987 to distance themselves from an investigation. 348 00:23:11,623 --> 00:23:14,625 Detective McAmis asks Mark about his whereabouts 349 00:23:14,627 --> 00:23:17,094 on the night the Tyrrells were murdered. 350 00:23:19,531 --> 00:23:24,068 On the day of April 30th, he went to work very early at approximately 5:30 a.m. 351 00:23:24,070 --> 00:23:29,807 He said he worked at IBM throughout the entirety of the day. 352 00:23:29,809 --> 00:23:36,380 At 7:45 p.m. Mark said he left to meet Gary at a local McDonald's at eight o'clock. 353 00:23:37,849 --> 00:23:42,052 Where he said he waited for about 45 minutes for Gary. 354 00:23:42,054 --> 00:23:44,889 When Gary did not show up for the meeting at McDonald's, 355 00:23:44,891 --> 00:23:48,159 he went on ahead and just drove to the Tyrrell residence. 356 00:23:51,730 --> 00:23:54,165 But said he, he could not get any answer of any kind, 357 00:23:54,167 --> 00:23:56,934 he said, he didn't notice anything wrong, 358 00:23:56,936 --> 00:23:59,904 and so after leaving the Tyrrell residence. 359 00:23:59,906 --> 00:24:02,072 He went back to work, 360 00:24:02,074 --> 00:24:05,376 he said he arrived at approximately 9:15 p.m. 361 00:24:06,945 --> 00:24:12,149 But we were able to confirm through Mark's brother that he had in fact seen Mark 362 00:24:12,151 --> 00:24:18,122 arrive at the IBM office at approximately 9:15 on the night of April 30th. 363 00:24:18,124 --> 00:24:22,893 We were able to eliminate him very quickly based on that. 364 00:24:22,895 --> 00:24:27,731 With Mark Porter cleared in the double homicide of Gary and Jan Tyrrell. 365 00:24:27,733 --> 00:24:31,469 Detective McAmis is back to square one in the investigation. 366 00:24:33,238 --> 00:24:35,739 It's very frustrating in cases with DNA 367 00:24:35,741 --> 00:24:38,876 whether there is no offender match in the database, 368 00:24:38,878 --> 00:24:42,413 and unfortunately you have to sort of sit and wait until 369 00:24:42,415 --> 00:24:46,350 that offender gets arrested for something else and the link gets made. 370 00:24:51,657 --> 00:24:55,025 With CSI having finished processing the crime scene, 371 00:24:56,161 --> 00:24:58,629 police release the Tyrrell home to Jessica. 372 00:25:03,301 --> 00:25:04,368 Being... 373 00:25:06,238 --> 00:25:09,006 in their house, 374 00:25:10,308 --> 00:25:11,308 and... 375 00:25:12,244 --> 00:25:13,611 they were not there, 376 00:25:14,412 --> 00:25:16,280 and they were not coming back, 377 00:25:18,049 --> 00:25:19,950 was incredibly hard. 378 00:25:22,754 --> 00:25:25,589 Jason and Jessica went throughout the home 379 00:25:25,591 --> 00:25:28,225 trying to identify anything that could be missing. 380 00:25:29,694 --> 00:25:35,165 A couple of ivory tusks were missing from the basement. 381 00:25:35,167 --> 00:25:38,636 Based on the location and the composition of the material 382 00:25:38,638 --> 00:25:41,238 that we found around both of the bodies, 383 00:25:41,240 --> 00:25:45,409 that led us to believe that the tusk was possibly used as a murder weapon. 384 00:25:47,480 --> 00:25:52,616 Jessica pointed out to us that her father often kept a tub of coins 385 00:25:52,618 --> 00:25:54,251 next to his desk 386 00:25:54,986 --> 00:25:57,154 and she said the coins were missing. 387 00:25:58,857 --> 00:26:00,324 During the processing of the scene, 388 00:26:00,326 --> 00:26:05,195 we located a coin ledger that Gary had. 389 00:26:05,197 --> 00:26:10,968 The list indicated that he had over $1,330 in face value coins, 390 00:26:10,970 --> 00:26:15,105 but the coins were worth approximately 22,000 dollars. 391 00:26:18,176 --> 00:26:21,312 Mark Porter would have obviously known 392 00:26:21,314 --> 00:26:25,482 that those coins would have been much more valuable than just the face value. 393 00:26:30,655 --> 00:26:32,122 Based upon our findings, 394 00:26:32,157 --> 00:26:36,594 we're gonna definitely have to take a much harder look into Mark Porter. 395 00:26:46,004 --> 00:26:49,640 After discovering the theft of Gary Tyrell's silver coin collection 396 00:26:49,642 --> 00:26:51,609 and a possible murder weapon. 397 00:26:53,312 --> 00:26:57,982 Detective McAmis is zeroing in on a previously cleared suspect, 398 00:26:57,984 --> 00:27:00,651 in the double homicide of Gary and Jan Tyrrell. 399 00:27:01,753 --> 00:27:04,555 Gary's close friend, Mark Porter. 400 00:27:11,229 --> 00:27:13,964 While speaking with Larry again, 401 00:27:14,833 --> 00:27:17,134 he seemed bothered by something. 402 00:27:17,136 --> 00:27:21,271 Larry got really stern with me and very focused. 403 00:27:24,209 --> 00:27:28,045 He told me that he was very suspicious of Mark Porter. 404 00:27:31,850 --> 00:27:33,117 Larry informed us 405 00:27:33,119 --> 00:27:36,320 that Mark had a severe gambling problem. 406 00:27:36,322 --> 00:27:39,990 He told us that Mark should be a very wealthy individual 407 00:27:39,992 --> 00:27:43,060 because he has a very lucrative job at IBM, 408 00:27:43,062 --> 00:27:46,330 making a lot of money, and is extremely successful. 409 00:27:49,868 --> 00:27:53,570 But Mark had asked for a quarter-million-dollar loan from Gary. 410 00:27:57,375 --> 00:27:59,643 Larry just thought that was preposterous 411 00:27:59,645 --> 00:28:03,080 and said Gary was not gonna give him that kind of money, 412 00:28:03,082 --> 00:28:05,916 and was shocked that Mark would even have the audacity 413 00:28:05,918 --> 00:28:07,518 to ask for such a sum. 414 00:28:10,822 --> 00:28:11,789 People who gamble 415 00:28:11,823 --> 00:28:14,692 often times have impulse control problems, 416 00:28:14,694 --> 00:28:16,927 or problems in terms of their thinking. 417 00:28:16,929 --> 00:28:19,797 They don't see their wins as independent events, 418 00:28:19,799 --> 00:28:21,632 they see themselves on a lucky streak. 419 00:28:21,634 --> 00:28:22,866 And if you're thinking 420 00:28:22,868 --> 00:28:25,169 in cognitively distorted ways like that, 421 00:28:25,171 --> 00:28:27,404 it may not be so much of a leap 422 00:28:27,406 --> 00:28:29,373 to think that you might resort to violence 423 00:28:29,375 --> 00:28:31,141 to repay your debts. 424 00:28:33,311 --> 00:28:35,646 If Mark is in debt 425 00:28:35,648 --> 00:28:37,648 to that point to where he's needing to request 426 00:28:37,650 --> 00:28:40,117 a quarter of a million dollars from Gary, 427 00:28:40,119 --> 00:28:42,386 it could obviously put some strain 428 00:28:42,388 --> 00:28:45,155 and give motive for these crimes. 429 00:28:47,392 --> 00:28:50,928 It was told to us that Mark was a very religious man, 430 00:28:50,930 --> 00:28:52,362 a family man. 431 00:28:53,364 --> 00:28:55,399 Obviously very intelligent. 432 00:28:55,401 --> 00:28:56,633 But in digging further, 433 00:28:56,635 --> 00:28:59,103 when we spoke with past co-workers 434 00:28:59,105 --> 00:29:00,871 and other people that knew Mark, 435 00:29:00,873 --> 00:29:04,141 uh, there was a different picture that was being painted. 436 00:29:04,943 --> 00:29:06,944 With this new information, 437 00:29:06,946 --> 00:29:09,980 Mark Porter goes from being a friend of the Tyrrells 438 00:29:09,982 --> 00:29:11,615 to being their possible killer. 439 00:29:14,119 --> 00:29:15,719 To build their case, 440 00:29:15,721 --> 00:29:18,188 detectives start digging into his background. 441 00:29:20,225 --> 00:29:22,159 We were able to locate evidence 442 00:29:22,161 --> 00:29:24,027 that showed Mark Porter had gambled 443 00:29:24,029 --> 00:29:26,363 hundreds of thousands of dollars, 444 00:29:26,365 --> 00:29:28,899 uh, throughout a several-year time period 445 00:29:28,901 --> 00:29:30,501 at various casinos. 446 00:29:34,305 --> 00:29:35,973 We also found that 447 00:29:35,975 --> 00:29:39,176 that Mark was in some serious financial difficulty. 448 00:29:39,178 --> 00:29:41,245 Mark got rid of a Lexus they had, 449 00:29:41,247 --> 00:29:43,413 and we also saw where he had sold 450 00:29:43,415 --> 00:29:45,949 a motorcycle that he was in possession of. 451 00:29:46,985 --> 00:29:47,951 Having established 452 00:29:47,953 --> 00:29:49,987 that Mark Porter had a clear motive... 453 00:29:52,690 --> 00:29:54,324 investigators need to prove 454 00:29:54,326 --> 00:29:57,327 whether he had the opportunity to kill the the Tyrrells. 455 00:29:59,731 --> 00:30:01,098 Looking for answers, 456 00:30:01,100 --> 00:30:04,835 Detective McAmis brings Mark's brother and boss, Bruce, 457 00:30:04,837 --> 00:30:06,236 in for questioning. 458 00:30:07,472 --> 00:30:11,141 When we asked him about Mark's gambling issues, 459 00:30:11,143 --> 00:30:12,843 he almost seemed put off 460 00:30:12,845 --> 00:30:13,977 and surprised and shocked 461 00:30:13,979 --> 00:30:17,347 that we would even be talking about such a thing. 462 00:30:17,349 --> 00:30:20,350 Mark was above that, that he was far too good, 463 00:30:20,352 --> 00:30:23,320 and said that Mark was not a gambler of any kind. 464 00:30:24,122 --> 00:30:25,823 For his brother not to know 465 00:30:25,825 --> 00:30:28,058 of the gambling issues going on with Mark, 466 00:30:28,060 --> 00:30:29,893 it was readily apparent to us 467 00:30:29,895 --> 00:30:32,396 that Mark was leading a double life. 468 00:30:33,331 --> 00:30:35,232 Investigators question Bruce 469 00:30:35,234 --> 00:30:39,203 about seeing Mark at the office around 9:00 p.m. 470 00:30:39,205 --> 00:30:42,272 He confirmed that he, in fact, did see 471 00:30:42,841 --> 00:30:45,509 Mark at the IBM office. 472 00:30:45,511 --> 00:30:47,978 He arrived at about 9:15 that night. 473 00:30:47,980 --> 00:30:50,747 What he told us that was a little different than Mark was, 474 00:30:50,749 --> 00:30:53,817 he said he had actually got in to the office before that, 475 00:30:53,819 --> 00:30:56,119 had seen some of Mark's belongings, 476 00:30:56,121 --> 00:30:57,888 and that Mark was gone 477 00:30:57,890 --> 00:31:00,123 for approximately 45 minutes. 478 00:31:01,459 --> 00:31:02,926 Mark had not told us that. 479 00:31:02,928 --> 00:31:05,195 Mark said that he arrived at the office, 480 00:31:05,197 --> 00:31:08,131 and said that his brother just happened to drive by. 481 00:31:08,133 --> 00:31:10,267 So, there was a little discrepancy 482 00:31:10,269 --> 00:31:12,569 in their scenarios right there. 483 00:31:14,639 --> 00:31:15,806 Right now, there's a whole bunch 484 00:31:15,808 --> 00:31:19,643 of circumstantial evidence pointing towards Mark 485 00:31:19,645 --> 00:31:22,412 as being our prime suspect, without a doubt. 486 00:31:22,414 --> 00:31:23,513 The problem is, is we have 487 00:31:23,515 --> 00:31:27,484 no hard physical evidence on Mark to this point. 488 00:31:31,656 --> 00:31:35,058 With the evidence stacking up against Mark Porter, 489 00:31:35,060 --> 00:31:37,728 Detective McAmis hauls him down to the station 490 00:31:37,730 --> 00:31:39,596 for another round of questioning. 491 00:31:41,232 --> 00:31:45,168 Mark denies both the loan and gambling issues. 492 00:31:45,170 --> 00:31:47,237 At one point, he finally admits 493 00:31:47,239 --> 00:31:49,072 that he gambles a little bit, 494 00:31:49,074 --> 00:31:51,141 but he says that it's no big deal 495 00:31:51,143 --> 00:31:53,110 and that it's not a problem. 496 00:31:53,112 --> 00:31:55,412 And essentially played that off as 497 00:31:55,414 --> 00:31:57,114 money is not an issue. 498 00:31:58,049 --> 00:31:59,917 So, we asked directly 499 00:31:59,919 --> 00:32:02,452 if he had any involvement in the crimes. 500 00:32:05,056 --> 00:32:09,026 And he denied anything to do with it. 501 00:32:10,628 --> 00:32:13,897 The fact that Mark presents as this successful business man 502 00:32:13,899 --> 00:32:16,934 and yet ends up immersed in this horrible tragedy, 503 00:32:16,936 --> 00:32:19,136 speaks to just how insidious 504 00:32:19,138 --> 00:32:21,605 and dangerous a gambling addiction is. 505 00:32:21,607 --> 00:32:26,410 I mean, just for the need to survive the addiction, um, 506 00:32:27,211 --> 00:32:30,013 can motivate extremely dangerous behavior 507 00:32:30,015 --> 00:32:31,648 up to and including murder. 508 00:32:32,717 --> 00:32:34,985 Detective McAmis redirects, 509 00:32:34,987 --> 00:32:38,322 and asks Mark when he was last inside the Tyrrell home. 510 00:32:39,123 --> 00:32:40,290 Mark told us that 511 00:32:40,292 --> 00:32:42,759 he last time he was at the Tyrrell home 512 00:32:42,761 --> 00:32:44,861 was on the Monday before the crime, 513 00:32:44,863 --> 00:32:47,831 which would have been just a couple of days previously 514 00:32:47,833 --> 00:32:49,967 to when we believe the homicides occurred. 515 00:32:51,002 --> 00:32:54,171 So, we asked Mark to submit to a DNA sample. 516 00:32:57,709 --> 00:33:00,210 And he was immediately stand-offish about that 517 00:33:00,212 --> 00:33:02,012 and that he would need to speak with a lawyer 518 00:33:02,014 --> 00:33:05,082 before he'd be willing to give us a DNA sample. 519 00:33:06,217 --> 00:33:11,722 It was a huge, huge flag for us. Very alarming. 520 00:33:11,724 --> 00:33:14,891 We're trying to solve the murder of his best friend, 521 00:33:14,893 --> 00:33:18,628 and here he is, he's not willing to cooperate. 522 00:33:18,630 --> 00:33:21,264 It was quite the telling sign right there 523 00:33:21,266 --> 00:33:23,033 that Mark had something to hide. 524 00:33:26,771 --> 00:33:29,206 Investigators have their prime suspect 525 00:33:29,208 --> 00:33:32,376 in the brutal double homicide of Gary and Jan Tyrrell... 526 00:33:33,611 --> 00:33:36,346 Gary's close friend, Mark Porter. 527 00:33:39,385 --> 00:33:41,785 But without a matching DNA sample 528 00:33:41,787 --> 00:33:44,287 to directly link Mark to the murders, 529 00:33:44,289 --> 00:33:48,225 Detective Neal McAmis searches for more evidence, 530 00:33:48,227 --> 00:33:50,660 and finds it in a surprising place. 531 00:33:52,196 --> 00:33:54,031 The investigator that 532 00:33:54,033 --> 00:33:58,301 decided to look for Mark in the pawn database, 533 00:33:58,303 --> 00:34:00,570 it was a brilliant move on his part. 534 00:34:07,912 --> 00:34:14,117 Mark had sold approximately $1,321 worth of coins. 535 00:34:14,119 --> 00:34:16,953 It was close to the amount of face value 536 00:34:16,955 --> 00:34:20,524 that was listed on Gary's ledger that he had. 537 00:34:24,729 --> 00:34:26,930 But when we, in fact, went to 538 00:34:26,932 --> 00:34:29,566 view the transaction at the coin shop, 539 00:34:30,768 --> 00:34:33,403 we found out that Mark was actually paid 540 00:34:33,405 --> 00:34:36,306 over $18,500 for the coins, 541 00:34:36,308 --> 00:34:37,941 which is right in line 542 00:34:37,943 --> 00:34:40,477 with what Gary had listed on his ledger. 543 00:34:43,381 --> 00:34:46,016 The owner of the coin shop confirmed that, in fact, 544 00:34:46,018 --> 00:34:50,087 he did do a large transaction of coins 545 00:34:50,089 --> 00:34:52,923 on the day after the bodies were found. 546 00:34:52,925 --> 00:34:55,826 The owner of the coin shop also has surveillance footage 547 00:34:55,828 --> 00:34:57,327 which indeed showed 548 00:34:57,329 --> 00:35:01,765 Mark Porter in the coin shop doing the transaction. 549 00:35:01,767 --> 00:35:04,067 And Mark Porter was wearing the same 550 00:35:04,069 --> 00:35:07,070 clothing he had on whenever we interviewed him, 551 00:35:07,072 --> 00:35:10,207 shortly after he did the selling of the coins. 552 00:35:11,742 --> 00:35:14,778 As intelligent as Mark is, 553 00:35:14,780 --> 00:35:17,280 it was very apparent, just his stupidity, 554 00:35:17,282 --> 00:35:19,249 when it came to criminal acts. 555 00:35:20,284 --> 00:35:22,652 Even though we have the coins, 556 00:35:22,654 --> 00:35:24,921 we still needed something a lot more solid 557 00:35:24,923 --> 00:35:27,524 in terms of physical evidence to proceed with the case. 558 00:35:28,926 --> 00:35:29,960 We know that we are 559 00:35:29,962 --> 00:35:33,497 somehow going to have to obtain Mark's DNA. 560 00:35:35,066 --> 00:35:38,101 To obtain Mark Porter's DNA, 561 00:35:38,103 --> 00:35:42,272 Detective McAmis organizes a large undercover task force. 562 00:35:44,375 --> 00:35:46,209 We put undercover officers, 563 00:35:46,211 --> 00:35:50,080 uh, maintaining surveillance of Mark for weeks at a time, 564 00:35:50,082 --> 00:35:51,848 to try to somehow 565 00:35:51,850 --> 00:35:54,317 discreetly get his DNA without him knowing. 566 00:36:02,026 --> 00:36:03,860 We're looking for any type of article 567 00:36:03,862 --> 00:36:05,896 that Mark might handle 568 00:36:05,898 --> 00:36:09,299 uh, or use that would produce his DNA. 569 00:36:09,734 --> 00:36:10,967 During this time, 570 00:36:10,969 --> 00:36:13,637 narcotics investigators are relaying to us 571 00:36:13,639 --> 00:36:17,140 that Mark's behavior is very strange and odd. 572 00:36:17,142 --> 00:36:18,441 He would go into a restaurant 573 00:36:18,443 --> 00:36:20,343 and he would not leave anything behind 574 00:36:20,345 --> 00:36:21,978 for them to obtain, 575 00:36:21,980 --> 00:36:24,848 and it was becoming very challenging 576 00:36:24,850 --> 00:36:28,318 for our undercover officers to try to get his DNA. 577 00:36:29,754 --> 00:36:31,688 After weeks of surveillance, 578 00:36:31,690 --> 00:36:34,357 Detective McAmis finally catches a break... 579 00:36:35,893 --> 00:36:39,329 when Mark Porter visits a lube shop for an oil change. 580 00:36:41,065 --> 00:36:42,699 One of our undercover officers 581 00:36:42,701 --> 00:36:45,035 went in and got an oil change with him. 582 00:36:46,938 --> 00:36:49,306 Mark had been drinking from a coffee cup. 583 00:36:52,176 --> 00:36:55,111 And when Mark's vehicle was finished, 584 00:36:55,113 --> 00:36:58,248 Mark put the coffee cup down and left it behind. 585 00:36:59,951 --> 00:37:03,587 Our undercover officer immediately seized the cup. 586 00:37:03,589 --> 00:37:05,956 And we transported it directly 587 00:37:05,958 --> 00:37:09,059 to the Missouri State Highway Patrol lab for testing. 588 00:37:10,461 --> 00:37:13,330 Less than 24 hours later, we had our match. 589 00:37:15,333 --> 00:37:16,633 It is confirmed 590 00:37:16,635 --> 00:37:18,635 that Mark's DNA is a match of that 591 00:37:18,637 --> 00:37:20,270 that we found on the latex glove 592 00:37:20,272 --> 00:37:22,239 that was located in the Tyrrell home. 593 00:37:27,178 --> 00:37:29,145 The feeling of elation was... 594 00:37:29,147 --> 00:37:31,014 it's almost indescribable. 595 00:37:31,016 --> 00:37:32,949 We knew that we were gonna be able to bring 596 00:37:32,951 --> 00:37:35,218 some kind of closure to the Tyrrell family 597 00:37:35,220 --> 00:37:37,187 along with being able to put away 598 00:37:37,189 --> 00:37:39,422 a very violent and vicious man. 599 00:37:41,259 --> 00:37:45,095 Detective McAmis is now able to piece together 600 00:37:45,097 --> 00:37:48,298 Gary and Jan Tyrrell's final 24 hours. 601 00:37:51,269 --> 00:37:52,869 Mark knows that Gary is supposed 602 00:37:52,871 --> 00:37:55,372 to teach a class that evening 603 00:37:55,374 --> 00:37:57,974 from 5:30 until 9:00 p.m. 604 00:37:59,777 --> 00:38:01,611 Approximately 5:30, 605 00:38:01,613 --> 00:38:03,546 Mark went to the Tyrrell residence... 606 00:38:06,817 --> 00:38:08,618 knowing that she would have been a roadblock. 607 00:38:11,989 --> 00:38:15,125 We believe that Jan turned down 608 00:38:15,127 --> 00:38:16,660 Mark's loan request. 609 00:38:19,030 --> 00:38:21,364 And it was at that point Mark snapped. 610 00:38:22,233 --> 00:38:24,100 Consumed with rage, 611 00:38:24,102 --> 00:38:26,202 Mark Porter grabs a walrus tusk 612 00:38:26,204 --> 00:38:28,605 from a nearby table and attacks Jan. 613 00:38:34,312 --> 00:38:36,980 After Mark kills Jan, 614 00:38:36,982 --> 00:38:39,249 we believe that he was looking throughout the home. 615 00:38:39,251 --> 00:38:42,085 He would've had knowledge of the valuables. 616 00:38:45,022 --> 00:38:46,956 Gary let class out early that night 617 00:38:46,958 --> 00:38:48,425 shortly before 7:00 p.m. 618 00:38:49,827 --> 00:38:52,429 It's right after that when Gary has a conversation 619 00:38:52,431 --> 00:38:54,097 with his brother Larry. 620 00:38:55,199 --> 00:38:56,866 We believe that Gary went home 621 00:38:56,868 --> 00:38:58,635 shortly after that conversation. 622 00:39:01,939 --> 00:39:05,408 And that's when he interrupted Mark's crime-in-progress. 623 00:39:05,410 --> 00:39:09,045 Mark possibly grabbed one of Gary's guns. 624 00:39:10,781 --> 00:39:12,315 He runs upstairs. 625 00:39:14,285 --> 00:39:16,119 And there's the confrontation 626 00:39:16,121 --> 00:39:18,254 right at the top of the stairway. 627 00:39:26,365 --> 00:39:28,164 Fired a couple shots at Gary. 628 00:39:31,102 --> 00:39:34,504 And then Mark proceeded to beat Gary 629 00:39:34,506 --> 00:39:36,139 as he lay on the ground. 630 00:39:43,848 --> 00:39:45,181 Mark gathers up 631 00:39:45,183 --> 00:39:47,951 the belongings, the walrus tusk, 632 00:39:47,953 --> 00:39:51,154 the murder weapon in terms of the gun, 633 00:39:51,156 --> 00:39:52,989 and the items that he stole. 634 00:39:55,726 --> 00:39:56,793 He left the house, 635 00:39:56,795 --> 00:39:58,995 even locking the door after he left, 636 00:39:58,997 --> 00:40:01,297 and fled the scene at that time. 637 00:40:04,735 --> 00:40:06,503 There was never any indication 638 00:40:06,505 --> 00:40:08,605 of any type of remorse whatsoever. 639 00:40:08,607 --> 00:40:11,408 There was never an apology to the family. 640 00:40:11,410 --> 00:40:13,910 Nothing at all to indicate that Mark felt bad 641 00:40:13,912 --> 00:40:16,012 about what he did. 642 00:40:16,014 --> 00:40:19,349 Throughout, he continued his arrogance and pompousness 643 00:40:19,351 --> 00:40:22,185 and it just speaks volumes of the type of individual 644 00:40:22,187 --> 00:40:23,586 that Mark really is. 645 00:40:24,922 --> 00:40:26,156 With the viciousness of the crime 646 00:40:26,158 --> 00:40:27,957 and the lack of remorse, 647 00:40:27,959 --> 00:40:31,961 Mark is most definitely a sociopathic type. 648 00:40:33,063 --> 00:40:35,365 Mark's narcissistic behavior 649 00:40:35,367 --> 00:40:40,236 and constant need to lie to people, 650 00:40:40,238 --> 00:40:43,373 uh, to show that he was 651 00:40:43,375 --> 00:40:47,076 successful and wealthy and capable, 652 00:40:47,078 --> 00:40:49,112 um, came shattering down around him, 653 00:40:49,114 --> 00:40:52,449 um, when his gambling debts caught up to him. 654 00:40:56,320 --> 00:40:58,321 I don't necessarily know that he went there 655 00:40:58,323 --> 00:41:00,223 planning to commit murder, 656 00:41:00,225 --> 00:41:02,192 but I think it was a perfect storm. 657 00:41:03,928 --> 00:41:05,094 Mark Porter is charged 658 00:41:05,096 --> 00:41:06,930 with first-degree murder 659 00:41:06,932 --> 00:41:09,199 in the deaths of Gary and Jan Tyrrell. 660 00:41:09,733 --> 00:41:11,067 He pleads guilty 661 00:41:11,069 --> 00:41:14,137 and receives two consecutive life-sentences. 662 00:41:16,807 --> 00:41:19,209 Arresting Mark was most definitely 663 00:41:19,211 --> 00:41:21,077 one of the highlights of my career. 664 00:41:22,413 --> 00:41:24,747 Being able to bring some closure 665 00:41:24,749 --> 00:41:26,249 to the Tyrrell family 666 00:41:26,251 --> 00:41:28,551 was just an indescribable feeling. 667 00:41:32,723 --> 00:41:33,823 I hope that 668 00:41:33,825 --> 00:41:35,992 the family gets some sense of justice 669 00:41:35,994 --> 00:41:39,062 knowing that this vicious, brutal killer 670 00:41:39,064 --> 00:41:41,297 will spend the rest of his life in prison. 671 00:41:44,101 --> 00:41:45,568 I miss most... 672 00:41:47,071 --> 00:41:48,638 just them being here. 673 00:41:54,044 --> 00:41:56,546 Their support. Um... 674 00:42:00,050 --> 00:42:02,385 They were always a phone call away. 675 00:42:03,888 --> 00:42:06,656 Despite the tragedy of losing her parents, 676 00:42:06,658 --> 00:42:07,824 Jessica Tyrrell 677 00:42:07,826 --> 00:42:10,426 continues to work to honor their memories. 678 00:42:12,396 --> 00:42:15,431 I would like my parents to be remembered 679 00:42:15,433 --> 00:42:19,068 as warm, loving couple 680 00:42:19,070 --> 00:42:21,938 who helped so many people. 681 00:42:23,307 --> 00:42:25,074 They made a difference in the lives 682 00:42:25,076 --> 00:42:26,342 of those around them. 55793

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