All language subtitles for Britains.Most.Evil.Killers.S02E06.WEBRip.en

-In February 1988, 29-year-old
carpenter John Duffy

was on trial for rape
and the murder of three women.

He was one half
of a terrifying duo

who had become infamous
across London.

The newspapers had dubbed them
the "Railway Killers."

-As one victim later said,

"They were like two bodies
with one brain."

They knew exactly what
the other one was going to do.

Their bond was unique
and wicked.

-After receiving
six life sentences,

Duffy still refused to give up
the name of his accomplice,

a 29-year-old father
of four named David Mulcahy.

-I think Mulcahy is somebody
who returns to a normal life

and has absolutely
no problem in doing that.

He didn't feel bad
about what he's done,

and it's very much about
self-preservation for him.

-But over a decade later,

Mulcahy was still free
and Duffy had had enough.

He finally confessed to all his
crimes and told investigators

he would testify against
his former friend.

-It was almost
as if he considered

this was an act of betrayal
to what was a unique

and wicked bond for decades.

These were so poles apart
now across the courtroom.

-John Duffy and David Mulcahy
had made their mark

as two of Britain's
most evil killers.

♪♪

♪♪

♪♪

Two rapists struck fear into the
hearts of women across London.

When John Duffy was arrested
in November 1986,

it brought an end to an horrific
4-year crime spree

across the British capital.

But it would be another 15 years
before Duffy's accomplice,

David Mulcahy,

was found guilty for his part
in the heinous crimes.

Between them, the deadly duo
were responsible

for over 20 rapes
and three murders.

It was Duffy's testimony at
Mulcahy's trial in the year 2000

that helped to incarcerate
his one-time friend.

-As the judge delivered
the sentence,

Mulcahy gave no reaction,
staring straight ahead.

The judge told him,
"These were sadistic killings,

and of the two of you,
I have no doubt it was you

who derived gratification
from the act of killing."

-One of the lead detectives
charged

with catching the so-called
Railway Killers

was Charlie Farquhar.

His son Simon remembers
the case well.

-These women had their lives
disfigured by these two men.

Three women lost their lives
to these two men.

Nothing can ever atone for that,

and it's a pretty grim thing
to immerse yourself in

for a period of time.

-Over 30 years
after the murders,

Simon has penned a book

about the hunt and capture
of Duffy and Mulcahy.

-Once I started to really delve
into it

and really investigate it,

I realized I was
completely unprepared

for just how horrific a case
like this actually is.

Unlike police officers,
you have all kinds

of defenses built up over years

and years to deal
with these sort of things.

I did wander into this
as a bit of an innocent,

and it does still
really haunt me.

-The story of these two killers
begins half a century ago.

John Duffy was born in 1958
and David Mulcahy in 1959

on separate sides
of the Irish Sea.

-Well, both Duffy and Mulcahy
are from Catholic families,

Irish-Catholic families.

Duffy was actually born
in the Republic of Ireland

and came over to England
with his family

when his father was
looking for work.

Mulcahy was born in England,
and he was the son of a man

who went on to become
a pub landlord.

-In 1970, the two 11-year-old
boys struck up a friendship

while attending Haverstock
School in north London.

-I think that Duffy and Mulcahy
came together

for a variety
of different reasons.

They were both
from Irish families,

and the Irish community
were still suffering

quite a lot of discrimination
at this point in time

in British society.

Also, there was a sense in which
they could be a partnership

because Duffy,
he was quite short.

He had red hair.
He was bullied at school.

But Mulcahy was bigger.

He was broader, and he could be
his protector, essentially,

so it was quite a brotherhood

really rather than any kind
of casual friendship,

and it was them against
the rest of the world.

-By the age of 13,

both boys were
already displaying

signs of disturbing behavior.

-Well, Mulcahy was suspended
from school

after he and Duffy
were found essentially

playing a version of cricket
but using a live hedgehog,

and they were found after
they had been engaging in this,

and Duffy was covered in blood,
and he was laughing at Mulcahy,

who was also covered in blood,

so this really is
quite a warning signal.

It's basically a complete
lack of empathy

for the feelings
of this living creature

that they were tormenting,

and they're starting
to experiment here.

Their behavior
is starting to escalate,

and it really is quite
a significant red flag.

-They became fascinated
with each other's company.

They would haunt Hampstead Heath
wearing Halloween masks

and jump out
and frighten courting couples

who used to meet on
Hampstead Heath, terrify them.

And they took enormous
pleasure from it.

-So these two,

they're really having the time
of their lives doing this.

They're really enjoying
having that power over others,

but I think to come
across them out there

in the park in the dark
would have been really,

really frightening.

-As the two teenagers
became young men,

Duffy and Mulcahy's scare
tactics took a criminal turn.

-So in their case,
you started with the pranks

and moved on to burglary
and car theft.

They stole the cars,
and they didn't steal the car

because they want
to sell the car.

It wasn't for profit.

They stole the car because
they wanted to drive around,

and they wanted have fun.

-But then we see that escalate.

We see that their physical
violence angle kind of start

to come out a little bit more,

so we hear stories of them
shooting at people

in the streets
with an air pistol.

-The pair found work
at Westminster City Council,

Duffy as a carpenter
and Mulcahy as a plumber.

On one job, Mulcahy had
spotted a woman

who he thought needed
to be taught a lesson.

He and Duffy went to her house
after dark intent

on raping the woman.

-So Duffy and Mulcahy
break into the house

and lay in wait for the woman

whose house Mulcahy
has been decorating,

but the woman, thankfully,
doesn't come home that night.

She's gone to a friend's.

This infuriates
both Duffy and Mulcahy.

-So you've got a plan
developing here.

They're starting to
actually decide,

"Well, this is what
we're going to do."

This isn't something
that's opportunistic.

This is something
that's very much premeditated.

-Duffy and Mulcahy
were undeterred.

They tried the same plan again
with a different woman

but escaped from her house when
she returned home with a man.

-And they're probably talking
about, "Say, look, the same old

breaking into people's house
and waiting for them is no good

because we don't know
if they're going to come back.

We don't know if they're going
to come back with somebody else.

So instead of that, how about
we actually drive around,

find someone, see someone
on the street,

and then we pounce on them

on a dark alley
or something like that?"

So I think the rush that they
got from breaking into the house

just motivated them to go
and do the real thing.

-By 1980, both men were in
their early 20s and married,

but their lust
for rape remained.

Two years later,
they were ready to strike.

-In October 1982, they found
the first one, 21-year-old girl

coming back from a party
carrying a teddy bear.

They put a knife to her throat

and forced her into a garden
of an empty house.

They said -- I think it was
Duffy who said,

"Don't worry.
We only want the teddy bear."

Nothing could have been
further from the truth.

They stripped the girl,
gagged her, blindfolded her

and raped her.

-From then on, the attacks
became incredibly prolific.

At one point, there was
three in one night.

They would generally drive
around together

listening to music
to psyche themselves up.

They carried with them
kits of balaclavas, or masks.

Mulcahy would put gaffer tape
inside his jacket,

which would then be used
to gag the victims.

They'd often
blindfold them, as well.

-Paul Cheston, from
the Evening Standardnewspaper,

recalls the fear felt
across the capital.

-That added to the sense
of terror felt by Londoners

that it was almost
a military-style operation,

and the planning
that was going into it

was much more than just spurred
attack, moment attacks.

-Mulcahy would always ask
the victims their names

and addresses as well

and would often steal items
which had their address

on it, library cards,
that sort of thing.

The idea was that if these
victims went to the police,

"We will find you,"
you know, and so on.

They always made sure
their victims were reduced

to a state of abject terror.

-One such attack occurred
in the summer of 1984.

-The attack on the two
Danish au pairs

took place in July 1984.

That night, Duffy and Mulcahy
had been driving around

for a long time
unable to find a victim,

and finally they saw
these two 18-year-old girls

walking along Spaniards Road
on the edge of Hampstead Heath.

They had been out
in the West End

and missed the last train home
and were walking back.

They decided
to attack them both.

Duffy had a replica gun.

Mulcahy had a knife.

They were dragged off the road
and onto the Heath and brutally,

brutally assaulted.

-For 3 years, Duffy and Mulcahy
continued undetected.

-In late 1985,

the police connected 24 attacks
on women in north London,

and posters went up
across London

for the north London rapists.

They knew they were
looking for two men,

a shorter man and a taller one.

They didn't know a great deal
about the taller man,

but they knew
that the shorter man was

an A-secretor blood group,
had fair hair.

The taller man, they knew
a lot less about.

He had a darker complexion.

He had a mole on his chin.

He had mousy brown hair,
was about 5-foot-11 tall

and was much more violent
than the shorter man.

-The majority of the attacks
had taken place

in the vicinity
of train stations.

The press had dubbed them
the "Railway Rapists."

-It was a very big story
in London

that was a widespread concern

not just because
rapists were loose

but because they were
finding victims

in and around railway stations,
and London is --

Millions of Londoners
travel on public transport,

and it was a serious,
serious concern for Londoners.

-But it was about to get worse.

Their next victim
would not just be raped.

She would be murdered.

By December 1985,
John Duffy and David Mulcahy

had been sexually
assaulting women

in and around railway stations
in London for over 3 years.

Still undetected by the police,
their confidence was growing.

-I think it was inevitable

that this was only going
to escalate further

because we've got two men here

who are really enjoying
the sexual violence

that they've been perpetrating,

and often when you
look at offenders

who are engaged
in this kind of behavior,

they're not going to just stop
at a particular level.

They want to keep
upping the ante,

so I think murder was
unfortunately inevitable here.

-On December the 29th, 1985,

Alison Day caught a train
to Hackney Wick station

to meet her fiancé.

-Alison Day was
a 19-year-old secretary

who lived in Upminster
with her parents.

She had been adopted as a baby
and brought into a very,

very loving household.

She worked as a secretary
in a local solicitor's office.

She was enormously
bubbly and popular,

and she had just got engaged.

-But Alison never
completed her journey.

-At that time,
obviously it was a torture

for her parents not knowing
if she'd just run away,

although it seemed absolutely,

you know, implausible
that she had.

What had actually happened
was that she'd got the train

to Hackney Wick,

and Duffy and Mulcahy were
waiting for her on the platform.

They could quite easily have
walked her out of the station,

but instead they decided to walk
her across the live rail tracks

down the railway siding and then
under the railway bridge.

There, they both committed
horrific attacks on her.

And at this point,
as far as Duffy was aware,

the plan was to leave Alison
on the far side of the bridge

and them make their escape,

but Mulcahy wanted to do
something more than that,

so he made her walk along
the outside ledge of the bridge.

She couldn't swim.

It was also 1 degree
below freezing,

and she fell into the River Lea

screaming out
that she couldn't swim.

She waded to the edge,
and Duffy helped her out,

and then she managed to run.

She ran for her life,
and this enraged Mulcahy.

And Mulcahy yelled out,
"Get the bitch, John. Get her."

-Duffy caught up with Alison,

but Mulcahy's slip of the tongue
had sealed her fate.

-He said to Duffy, "We have to
do this because she's seen us,

and she knows your name now."

-He cuts up the blouse
she's wearing

and uses it to strangle her.

And he says to Duffy, "You turn
the tourniquet one more time

just so that
we're in it together."

-Alison was begging
and pleading for her life,

and her last words were,

"Please, it's only
the mustache I've seen.

I won't tell anyone.
Do not hurt me."

It's just unbelievable.

She was strangled,
rolled into the river,

and then they both drove back.

Duffy was panicking.

Mulcahy said,
"We would have been done

for attempted murder anyway.
It's got to be --

That's just the way it is."

He dropped Duffy off.

Mulcahy picked his children up,
went back home,

and Alison Day was dead.

-The 19-year-old's body
was found 3 weeks later

face-down in a canal.

The Railway Rapists had become
the Railway Killers.

Duffy and Mulcahy had
strangled Alison to death

using a tourniquet.

-I think when we're looking
at the murder of Alison Day,

and we hear about them twisting
the tourniquet together,

basically what they're
doing here is saying,

"We're in this together.
We've both done this.

You can't blame it on me.
I can't blame it on you."

So there is that pact going back
to their school days

when they said they're not
going to grass on each other.

That really is the kind
of cementing of that.

-Less than 6 months later,
Duffy and Mulcahy struck again.

This time, their victim
was even younger.

-Maartje Tamboezer was
a Dutch schoolgirl.

She had just celebrated
her 15th birthday.

On Thursday, the 17th of April,
at 4:00 in the afternoon

after coming home from school,

she had something to eat,
had a drink,

and then got on a bike
to cycle into the village

to buy some sweets
from the shop.

Her mum said to her,
as she always did,

"Don't take the railway path

because it's very quiet
along there.

Take the long way around."

Maartje, being a teenage girl,
thought, "It'll be all right,"

and she took the railway path,
and Duffy and Mulcahy

were waiting
at the end of it for her.

-Maartje was raped by both men

in the woods
near Horsley station.

Mulcahy used a rock to knock

the 15-year-old
schoolgirl unconscious

and then made the decision
that she had to die.

-He then instructs Duffy
that he has to kill her.

"After all,
I killed the first one.

You've got to kill
the second one."

They take her belt,
put it around her neck,

and they stick a stick
through the belt

to tighten the pressure
on her neck.

And they do indeed kill
the poor 15-year-old, innocent,

had done nothing more
than ride her bicycle,

and she had done nothing
to these two men.

It was an absolutely abhorrent,
depraved, disgraceful crime.

-Once Duffy had killed
Maartje Tamboezer,

Mulcahy ran up to him and says,

"Well-done. You've done good,"

almost like he was the captain
of a football team

congratulating a new player.

He then told Duffy to go back
to the station

and said he would see him there.

He said he wanted to go
back to the body

to make sure there were no
fingerprints left on the rock.

He actually went back
to make sure that she was dead

and to make
a pretty vile attempt

to destroy any forensic evidence

there was by setting
fire to her.

-Maartje's body was found
in the woods the following day.

-The sight that greeted
those police officers

was absolutely horrific.

She had been savagely raped,

submitted to brutal
head injuries,

strangled, and the body
had been set on fire

in a clear attempt
to destroy forensic evidence.

She was lying beside
some bluebells,

and the police
christened the inquiry

Operation Bluebell
in tribute to her.

-Metropolitan Police
Detective Charlie Farquhar,

who was investigating
the murder of Alison Day,

contacted his colleagues
in Surrey Police.

He believed the two
murders were connected.

-And when he told Surrey
on the phone,

Surrey realized
that the piece of wood

that was lying next
to Maartje's body

wasn't in fact just a piece
of wood on the ground.

It had actually fallen out
of the knots in the rope,

and obviously it was
the same murder method.

And at that point, this became
a joint-murder inquiry.

Shortly afterwards,
the connection was made

with the London rapes,

and this went from
being a small inquiry

being run from a portacabin
to the biggest criminal manhunt

since the search
of the Yorkshire River.

-Duffy and Mulcahy
didn't wait long

to claim their third victim.

On May the 18th, 1986,
recently married Anne Locke

boarded a train from Brookmans
Park station in Hertfordshire,

but she never made it home.

-Anne Locke was 29 years old.

She was a bright,
attractive girl

with a huge amount of talent
and future in broadcasting.

She was a secretary at
London Weekend Television,

and she was in love.

She had been married
just 4 weeks earlier

and returned from a dream
honeymoon in the Seychelles,

had gone scuba diving.

She still had a suntan
from that lovely holiday,

and she disappeared.

-Paul Dockley
from the Hertfordshire Police

led the inquiry
into Anne's disappearance.

-The weirdest thing was
that the initial officers

attending this
missing-person inquiry

discovered that her bike
was missing,

and in fact we found it
behind the shed

leaned up against a tree,

which was unusual
to say the least.

And so we started searching.

We started searching around
the railway station.

We also did a trawl of people
that may have been on the train

coming out of London
on that particular night.

-It was the latest twist
in a story

that had captivated
the British public.

-The disappearance
of Anne Locke

was a media sensation
that summer.

The "Missing Bride Story,"
as it was called.

-And the headlines about
Missing Bride escalated.

The speculation
became more forensic

about what could have
happened to her.

They were already piecing
her disappearance

to the two previous murders,

and there was a tangible air
of, you know,

"What are the police doing?
They cannot even find a body

let alone
find the people responsible."

-But the police
had little to go on.

They could not even be sure

that Anne had reached
Brookmans Park station.

-The first time that the
police genuinely realized

that Anne was probably dead

was when Inspector Paul Dockley
was searching the area,

and even though
the search was massive,

the search was generally
at ground level,

and being a good detective,
he looked up,

and up in the trees, cradled in
the branches, was Anne's diary.

-I didn't know it was Anne's
diary immediately,

but I saw it in the tree,
so we recovered that.

And within the next day,

we reasserted our search
in the area

and recovered her purse,

her LWT pass
and her address book.

So at that point,

which was probably
4 weeks into the inquiry,

we knew at that point that Anne
had returned to Brookmans Park.

-And just a week later,

the police found out
the devastating truth

of what had happened
to 29-year-old Anne.

-Eventually, after 9 weeks,
the search was called off.

The police had gone to the edge
of the Hertfordshire boundary

and still couldn't
find anything.

And then a few days later, some
railway workers found her body

just into
the Metropolitan Police District

dreadfully decomposed.

-Following the discovery
of Anne Locke's body,

we actually developed
a joint investigation

with Hertfordshire,
The Met, Surrey,

and British Transport Police.

Investigating a murder is almost
like starting a jigsaw puzzle

with a piece of blue sky
because you do not know

the pattern
of how things have occurred.

You're faced with a scene,
but it doesn't actually tell you

necessarily who the offender is,

so you're working through that
jigsaw of trying to put together

all the elements
in order to prove a case.

And it's hard as a detective
to detach yourself

from what you actually see.

You're dealing with this
on a regular basis, and, well,

I don't think I've ever
come across a case like this.

-As one victim later said,

"They were like two bodies
with one brain."

They knew exactly what
the other one was going to do.

They split up and ran
in different directions.

They knew where they were
going to meet up and so on.

Their bond was unique
and wicked.

-While police from
three regions searched for them,

Duffy and Mulcahy remained
hidden in plain sight,

married men with regular jobs,

but the net was
closing in on the pair.

In the summer of 1986,
Hertfordshire,

Surrey, and London's
Metropolitan Police forces

were working together
to try and capture

the two men the papers were
calling the Railway Killers,

but the evidence
they had was minimal.

-So this was the 1980s.

Forensic science
was still in its infancy

compared to the advances
that have been made since.

Also, it wasn't just
forensic science

which was in quite
a primitive state at the time.

Also, police treatment
of sexual crimes

wasn't as sophisticated or
as understanding as it is now.

-The surviving victims
had provided

investigators with descriptions
of their attackers.

They knew that one of the
rapists was tall and violent,

the other short
with piercing blue eyes.

Forensic evidence suggested
that the shorter man

had the blood group A.

-We were literally going
through a list of people

that could be possible
offenders called the Zed Men.

And the Zed Men
had been previously arrested.

And you got to remember
this is pre-DNA,

so we're the precursor to DNA,

and we were looking
at A-secretors,

so people who secreted
in their blood

or their saliva or semen
an A-secretor factor.

-The Zed Men had over
2,000 people in it.

John Duffy was on it
because of a serious assault

on his wife the previous year.

He was number 1,595
on that list,

and it was just a case
of working through the list

and interviewing
every single one of those men.

Eventually,
number 1,595 came up,

and it was time for him
to be questioned.

He sat down.

He was quite polite
and cooperative

but was behaving
rather strangely.

He was trying
to be much too helpful,

and his answers
were rather glib.

The two police officers
interviewing him

had an uneasy feeling.

They left the room
and said to each other,

"This could be him,"

not least because of these
piercing blue eyes he had,

which many of the rape victims
had commented on the shorter man

having great,
piercing blue eyes.

-Despite their suspicions,
Duffy was released,

but before long, he was back.

-The two investigators
rang me and said,

"Governor,
you won't believe this."

He said, "Last night,
John Duffy presented himself

at West Hampstead
Police Station.

He'd been slashed across
the chest with a blade,

and he was saying
that he had amnesia.

I took him to his home address.

He didn't recognize his mom,
his dad, his dog, nothing."

And he was taken
to Friern Barnet Hospital,

where he was sectioned.

-The investigation had
taken a bizarre twist.

Duffy was still a suspect,

but the police were not
permitted to talk to him

while he was sectioned.

-So Duffy was at
Friern Barnet Hospital,

and we weren't allowed
to interview him

for at least 8 weeks,
and unbeknown to us,

we thought he was in a secure
unit at Friern Barnet Hospital.

In actual fact, he was allowed
to come and go.

-Duffy had been attacking
on his own since mid-1984,

and unlike Mulcahy,

didn't possess the same
level of self-control.

He was becoming wildly unstable,

and he also took
a lot more risks

when he was carrying
out these attacks

and was much more careless.

-And, unfortunately, he went
out to a railway line

and raped a young girl

whilst he was in the care
of Friern Barnet Hospital.

-The last attack
he committed

when he knew the police
were closing in on him

was on a 14-year-old
schoolgirl in Watford,

and during that attack,
her blindfold slipped,

and she saw him very clearly.

When Duffy was arrested, that
girl walked into the I.D. parade

and walked straight up
and pointed him out,

and at that point, that was
the end for John Duffy.

-He said nothing.

He said "No comment"
to everything.

He didn't deny anything.

He just said, "No comment."

And he would talk to me about
martial arts as long as the day.

You know, he was quite happy
to talk about that,

but anything to do with rape,

missing girls, murders,
not interested.

And, of course, his answer was,

"I've been in hospital.
I've had amnesia.

I don't remember anything.

I don't remember anything
before going into hospital."

-Detectives knew they needed
some solid evidence

if they were going to
charge Duffy with murder,

and the string that he
and Mulcahy had used to tie up

Maartje Tamboezer
7 months earlier

was about to give
them just that.

-They used a particular
piece of string

that was called somyarn,

and a lot of us will think
string is string is string,

but when you get down
to the forensic detail,

how it's made,
what it's made of,

all of these things
can be very different,

and if you happen to use
a very unusual piece of string,

it's going to help identify
where that's come from.

-And the company said, "This is
a very unusual piece of string

because it's been taken
from the end of the yarn,

so basically it's on a loom,
and it's cut,

and this is an end piece."

And they said to us, "If you
can find the ball of string,

we could do a match."

So the search team who went
to Duffy's parents' address

searched the outside toilet,

and in a bucket in there
was a ball of somyarn.

-It was enough to finally put
an end to the murderous career

of one of the Railway Killers.

-Gradually, the evidence is
building up against Duffy,

and he was charged with
the murder of Anne Locke

in addition to the murder
of Alison Day

and Maartje Tamboezer
and a number of rapes.

-Investigators were certain
that Duffy's accomplice

was his oldest friend,
David Mulcahy.

-He was actually arrested four
times over the next few months.

Every time that police
got another break,

they brought him in again

but eventually realized there
just wasn't enough evidence.

There was no forensic
evidence to connect him

with the crimes at all.

When they searched
these vehicles,

they found in the cab
of his van masking tape,

balaclavas, all sorts of things
that incriminated him,

but none of it was enough.

-But his name was known
to the press,

and a lot of people,
a lot of pressmen,

went to see him to see

just to gauge what
sort of reaction he would give.

Of course,
there was no reaction.

He would say, "No comment,"

and he got increasingly angry
about what he called harassment,

but the press knew that
there were two people involved

in the Railway Rapist cases,

and Duffy's friend
was the prime suspect.

-John Duffy would go
to trial alone,

and there was more bad news
for investigators.

The judge instructed the jury

to dismiss the murder charge
of Anne Locke

due to a lack of evidence.

-This caused a lot of anguish
with Anne Locke's family

and was a surprise
amongst the press,

but the problem was that
in the Locke case

there was no surviving victim
to give any evidence.

There were no witnesses
to the attack,

the fact that the body had laid
unfound for 2 months,

that there was no DNA evidence.

-In February 1988,
John Duffy's trial

began
at the Old Bailey in London.

-John Duffy walked into
the witness box

at the Old Bailey

and put up one of the worst
defenses ever heard

by an Old Bailey jury.

To suggest that he was
suffering from amnesia

and could remember nothing about
what happened during the period

in which he was accused
of the murders and rapes

was frankly an insult to the
intelligence of anyone in court,

let alone the jury.

His whole body language
was of defiance.

"I am going to give you nothing.

I am standing here sticking
to my story, and I don't care."

And the piercing eyes that
his victims spoke of, the wild,

staring blue eyes,

absolutely radiated out from the
witness box across the court.

-Duffy was found guilty of
two murders and five rapes.

He was given six life sentences,
but despite everything,

he refused to give up the name

of his accomplice
and best friend.

-Well, maybe the reason

why Duffy kept quiet
right at the beginning,

they had their agreement that
they had from a very young age,

and they never broke
that agreement,

"We're never going to rat
on each other."

So when he went to prison,
he probably decided,

"I'm going to stay true because
I am, you know, a good friend,

or I am the man I am, whatever,
I was true to my word."

-As Duffy's sentence began,

David Mulcahy
remained a free man.

The man and father of four set
up his own decorating business,

and life went on as normal.

-I think Mulcahy is somebody
who returns to a normal life

and has absolutely
no problem in doing that,

and that's because
he can switch.

He can flip very easily

because he doesn't feel
empathy for his victims.

He doesn't feel bad
about what he's done,

and it's very much about
self-preservation for him.

-Everybody knew
that David Mulcahy

was the second man,

but he honestly thought
that he got away with that,

and for the next 10 years
he pretty much had.

-But as Duffy's time
in prison passed by,

something inside of him clicked.

After claiming to be
suffering from amnesia,

he suddenly got his memory back.

By 1999, he was ready to talk
and tell the police

all about his accomplice,
David Mulcahy.

11 years after his conviction,
John Duffy was in prison

serving six life
sentences for his part

in a series of rapes
and murders in and around London

between 1982 and 1986,

but Duffy's partner in crime,
David Mulcahy, remained free.

-Mulcahy was one
who first suggested,

"Let's break
into the girl's house."

He was the one
who first suggested,

"Let's go and find victims
on the street,"

and he was the one
who first suggested,

"Let's commit murder,"

but the one who was paying
all the price was Duffy,

so it's very, very easy for you
to see that after 10 years,

you know, the little fuse
from Duffy got to an end,

and he was like, "Forget it.
I'm going to come clean."

-In 1997, Duffy, who had
originally claimed

to be suffering from amnesia
about the crimes,

had begun visiting
a prison psychologist.

-So basically Duffy had been in
prison for 10 years and thought,

"This is an opportunity
to talk and talk and talk,"

and basically he told
the psychologist

about the offenses
he had committed

and the fact that he hadn't
committed them alone.

-During their conversations,
Duffy reveals that he committed

these crimes
with another person,

and she casually asked which
prison his codefendant is in.

And Duffy drops the bombshell.

"He's not in prison.
He was never caught."

She says, "I have to tell
the police about this,"

which Duffy agrees to.

And so she tells the police,
"John Duffy has just named

his accomplice.

It's someone
called David Mulcahy."

-It was a big breakthrough for
detectives who had been trying

to bring Mulcahy to justice
for over a decade,

and a huge slice of fortune was
about to initiate his downfall.

-There's an extraordinary
coincidence here.

At the same time
that this was going on,

a similar series of attacks was
taking place on Hampstead Heath,

and police began to suspect

that David Mulcahy may
have become active again.

They had a DNA profile
for the attacker.

Mulcahy was brought in,
questioned.

They took his DNA,
and it didn't match.

And once again, he left
the police station very cocky,

very arrogant.

-But the police now had
Mulcahy's DNA on file.

They had to go back 15 years
to find a match.

-Amazingly, in deep storage,

was the clothing
of the Danish au pairs' rapes

on Hampstead Heath in 1984,

and when the clothing
was run through forensics,

one sample of clothing
had Duffy's DNA on it,

and the other had
David Mulcahy's DNA.

And suddenly, after all
those years of thinking

he got away with it,

suddenly that case had
come back to haunt him.

-On February the 6th, 1999,

David Mulcahy
was taken into custody.

He would never be free again.

-As soon as I found out
that the police had arrested

and charged a new suspect
in the Railway Rapist cases,

I, like every other pressman

who had been in any sort
of involvement in the case,

immediately knew
that it had to be David Mulcahy.

-He thought that they were
just clutching at straws.

He thought that this was just
another attempt to arrest him

which was going to fall through.

When they sat down
to question him,

the first thing they asked him
was about the night

of the 15th of July 1984
in the company of John Duffy,

and he wasn't expecting
that at all.

And then the police revealed
that they'd found his DNA

on an exhibit from that crime,

and the odds of it being
another person other than him

were one in one billion,

at which point a police officer
held up the wastepaper basket

because he was violently sick,

and he realized
that the game was up.

-Mulcahy's trial was set
for October 2000,

and the prosecution had
a surprise witness lined up.

John Duffy was ready to testify
against his former friend.

He had admitted to detectives
that the pair had killed

all three women,
including Anne Locke.

-Duffy couldn't be retried
for the murder of Anne Locke

because at that time
they were still enforcing

something called
the double-jeopardy rule,

which means you can't be tried
for the same crime twice.

It's a silly law,
which is now gone,

but Duffy said himself
at the time,

"If I could be tried again
for this one, I would be."

So there was never any point
where he was trying

to minimize his involvement.

-After it seemed like he was
going to get away with murder,

the gathered press were excited
to finally see Mulcahy on trial.

Paul Cheston was in
the courtroom throughout.

-The Mulcahy trial was
unquestionably the trial

of the year at the Old Bailey.

There was huge anticipation
at reopening

this historic case
dating back almost 15 years,

and, as always,

when the case opens
and the defendant is brought in,

everyone's eyes just immediately
shift straight to the dock.

He looked more like a bank
manager than a serial killer,

and he immediately set about
getting an air of relaxed

as if this was just
maybe a formality

that would be thrown out
of court straight away.

-On November the 6th, 2000,

John Duffy entered the courtroom
to give evidence

against his former friend
and accomplice.

-There was huge anticipation,
a real frisson in court

when John Duffy shuffled in
through the judge's entrance,

not through the main entrance

because he was
a category A prisoner,

the first category A prisoner,
serving life, murderer,

to give evidence for the crown
at the Old Bailey.

And when he entered court,
he shuffled.

He had his head down.
He would mumble.

The piercing eyes were hooded.

He didn't want to look up.

-The tension in the courtroom

between the two killers
was palpable.

Duffy avoided eye
contact with Mulcahy.

-It was almost
as if he considered

this was an act of betrayal,

and he couldn't look
in that direction.

He didn't want to
catch Mulcahy's eye.

Meanwhile, Mulcahy in the dock

was acting as if
he'd never met him,

and this was some
complete stranger.

And he was scribbling notes
on this and that,

and this seemed bizarre
for what was a unique

and wicked bond for decades.

These were so poles apart
now across the courtroom.

-True to his word,
Duffy gave a detailed account

of the duo's career
of rape and murder.

-His accounts,
particularly of Alison Day

pleading for mercy
with Mulcahy claiming,

"We're going to have to kill her
because she's seen us,"

and Alison Day saying,

"I've only seen a mustache,
and don't do this to me.

Don't hurt me.
I won't tell anybody,"

and Mulcahy,action
in Duffy's words,

twisting the tourniquet
and throttling her to death,

that for the first
and only time,

John Duffy showed
a glimmer of remorse.

His eyes welled up,
and his voice faltered.

The judge called a halt.

He was led away,
and the case was adjourned

for 10 to 15 minutes.

-Duffy gave testimony
across 2 weeks

of the 5-month murder trial.

On February the 2nd, 2001,
the jury had made a decision

on the fate of David Mulcahy.

-And when the jury forum
was asked to go through

on each count
on this long indictment

and answered the first,

"So did you find Mulcahy guilty
or not guilty?",

answered, "Guilty," there was
such an escape of emotion

and, like, steam
from a kettle of relief,

and then it went through
the indictment,

"Guilty. Guilty. Guilty.
Guilty. Guilty."

-And when it came to
the verdict on Anne Locke,

because this had been
a case of Duffy

had been found not guilty of
because of the lack of evidence,

this was finally the chance
to really lay this to rest.

And when a "Guilty"
came in on that as well,

the atmosphere was extraordinary
in that court.

-And there was a lot of victims,
a lot of victims' families,

in court, an inevitable outbreak
of relief, of tears.

Mulcahy himself seemed
entirely unmoved.

It's almost as
if he expected it,

and it was an extraordinary
scene at the Old Bailey,

even by the Old Bailey
standards.

-And David Mulcahy had
nothing else,

no other way of hurting
those victims anymore,

so as he walked out of the dock,
he looked over

at two of the victims
sitting in the public gallery

and smirked at them.

It was his last desperate act of
revenge, and then that was it.

And then he was promptly
sentenced to a total of

258 years in prison,

so I think we can safely say
he's never going to get out.

-Sentencing Judge Michael Hyam
told Mulcahy,

"There were acts
of desolating wickedness.

You descended to
the depths of depravity."

-Finally, 15 years after
the murder of Anne Locke,

John Duffy and David Mulcahy
were both behind bars.

12 years were added
to Duffy's sentence

while Mulcahy has still never
confessed to any of the crimes.

-I think the fact that Mulcahy
has always maintained

his innocence

really is a testament
to his narcissism.

He is protecting
the image of himself

that he's putting out
there to other people.

He doesn't want others
to believe that he is

this individual who has carried
out these heinous crimes.

-There's always been
speculation that Duffy

and Mulcahy
were guilty of other rapes,

several of which will not
even have been reported,

but thank goodness at least,
finally,

they were brought to justice.

-These were perhaps crimes
that they may not have committed

had they never met,
but they come together,

and you create
the perfect storm.

-For 4 years,
John Duffy and David Mulcahy

targeted vulnerable women
in and around London.

They callously raped
over 20 and murdered three,

one of them
a 15-year-old schoolgirl.

Although
initially detained in 1986,

it wasn't until Duffy
broke the bond

that he and Mulcahy have shared
since their childhood

that their world of lies
fell apart and justice

was finally served
upon the twisted pair

known as the Railway Killers.

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