Dennis Nilsen: From Quiet Boy to Muswell Hill Murderer
Updated: Aug 25
For five years, one of the most dangerous men in Britain caught the bus to work every morning, sat behind a desk at a Jobcentre, and helped strangers fill out unemployment forms. His colleagues thought he was a bit odd, maybe a bit lonely, but reliable. Nobody clocked that he was going home most nights to a flat where bodies were hidden under the floorboards. That's the strange, uncomfortable core of the Dennis Nilsen story. Not a monster lurking in the shadows, but a quiet, unremarkable man who blended into everyday London so well that he got away with murder for the best part of five years.
AT A GLANCE
Born: 23 November 1945, Fraserburgh, Scotland
Died: 12 May 2018, York Hospital, aged 72
Known victims: 12 confirmed murders, at least 7 further attempted murders
Locations: 195 Melrose Avenue, Cricklewood, and 23 Cranley Gardens, Muswell Hill
Active: 1978 to 1983
Caught: 9 February 1983, after a blocked drain led to the discovery of human remains
Convicted: 4 November 1983 at the Old Bailey, on six counts of murder and one of attempted murder
Sentence: Life imprisonment, minimum 25 years, converted to a whole life tariff in 1994
A Boy from Fraserburgh
Dennis Andrew Nilsen was born on 23 November 1945 in Fraserburgh, a fishing town on the Aberdeenshire coast. His mother, Elizabeth Duthie Whyte, was Scottish. His father, Olav Magnus Moksheim, was a Norwegian soldier stationed nearby during the war. The marriage didn't last. Nilsen's parents split up in 1948, and he grew up largely in his grandparents' house, a home he'd later describe as cold and joyless.
The one bright spot was his grandfather, a fisherman who took him on long walks along the harbour and across the dunes. Nilsen called him his "great hero and protector," and those walks were some of the only truly happy memories he carried into adulthood. Then, on 31 October 1951, his grandfather died of a heart attack at sea. He was 62.
Nilsen's mother let him view the body in an open coffin, telling her six year old son his grandfather had simply gone "to a better place." It's a detail that shows up again and again in accounts of Nilsen's life, because he pointed to it himself as the moment something in him changed. He remembered the stillness of the body, the strange peace of it, more vividly than almost anything else from his childhood. Not long after, he nearly drowned at Inverallochy beach and was pulled out by another boy. He later said the sensation of sinking had felt oddly calm too.
By the time his mother remarried in 1955 and the family moved to the nearby village of Strichen, Nilsen had already withdrawn into himself, more comfortable watching fishing boats from the harbour wall than sitting with his own family.
That isolation deepened through his teenage years, when he realised he was gay in a corner of 1950s Scotland where that realisation brought nothing but shame. He kept it to himself, and his brother, sensing his discomfort, needled him over it. By 1961, all Nilsen wanted was out. He enlisted in the Army Cadet Force that year, and the structure and anonymity of military life felt, for a while, like an escape from everything that had made him feel so alone.
The Army Years and a Darker Fantasy
Nilsen joined the Army Catering Corps properly in September 1961 and trained at St Omer Barracks in Aldershot. He later called those first three years "the happiest of my life," and even took part in a ceremonial parade in front of Queen Elizabeth II and Field Marshal Montgomery. For a young man who'd spent his adolescence feeling invisible, it must have felt like finally belonging to something.
Over the next decade he served in West Germany, Aden, where he was once kidnapped by a taxi driver and beaten unconscious before fighting free, and Cyprus. In West Berlin he had his only sexual experience with a woman, a prostitute he found "depressing." He kept his sexuality hidden throughout, sometimes showering alone just to avoid being seen.
It was during a posting in Osnabruck in 1964 that something shifted. After a heavy night of drinking with a fellow soldier, Nilsen woke up on the floor beside the man, unconscious. He found himself strangely drawn to the stillness of it, to having someone there who couldn't reject him or leave. Over the following years, his fantasies quietly reshaped themselves around that idea, a partner who was passive, silent, and entirely his. By the time he left the Army in October 1972 after eleven years of service, that fantasy had taken firm root.
London, a Uniform, and a Widening Loneliness
After the Army, Nilsen swapped one uniform for another and joined the Metropolitan Police in December 1972, training before being posted to Willesden Green. He liked the work but missed the camaraderie of military life, and he found himself drifting into London's gay pubs, chasing brief connections he later described as "soul destroying."
His father died in Ghana in August 1973, leaving him a small inheritance. He left the police that December, worked briefly as a security guard, and by mid 1974 had settled into a job as a civil servant at a Jobcentre on Denmark Street, helping unemployed Londoners find work. Colleagues remembered him as quiet and conscientious, a hard worker who kept to himself. Nobody thought twice about the loner behind the counter. He'd be promoted twice over the next few years, all while living a completely separate life at home.
David Gallichan and a Brief Taste of Domestic Life
In November 1975, Nilsen was walking through Cricklewood when he spotted a young man being harassed by two other men outside a pub. He stepped in. The young man was 20 year old David Gallichan, newly arrived in London, unemployed, and staying in a hostel. The two of them talked all night, and by the next day they'd agreed to move in together.
Using the money left to him by his father, Nilsen rented a ground floor flat at 195 Melrose Avenue in Cricklewood, with sole use of the garden thrown in. Gallichan took charge of decorating while Nilsen settled into the role of provider. For a short while, it looked like the beginnings of a real home. But the relationship cooled fast. They ended up sleeping in separate beds, both quietly seeing other people, and by May 1977, after one argument too many, Gallichan moved out for good.
What followed was eighteen months of short, failed attempts at connection. By late 1978, Nilsen had given up on finding anyone and settled into a routine of solitary drinking and music in the evenings. It was into that emptiness that his old fantasies finally found room to grow.
December 1978, the Night Everything Changed
On 30 December 1978, Nilsen met 14 year old Stephen Holmes at the Cricklewood Arms. Holmes had been trying, and failing, to buy alcohol on his own. Nilsen offered to take him back to the flat for a drink and some music instead, and the boy agreed.
They both fell asleep. When Nilsen woke, he found himself terrified that Holmes would leave once he did too. He strangled him with a necktie until he passed out, then drowned him in a bucket of water. Afterwards, he washed the body, laid it out, and eventually hid it beneath the floorboards, where it stayed for nearly eight months before he burned it in the garden. He would later write about "easing him into his new bed," a chillingly domestic phrase for what he'd just done. It was the first of at least twelve murders, and it set the pattern for everything that followed.
The Flatmates Who Never Left
Nilsen's second victim was Kenneth Ockenden, a 23 year old Canadian tourist he met in a West End pub in December 1979. He offered to show him around the city, then strangled him with a set of headphone cords back at Melrose Avenue and kept listening to music through the same pair afterward. He dug the body up from under the floorboards more than once over the following fortnight, propping it in an armchair while he watched television.
In May 1980, 16 year old Martyn Duffey became his third victim. Duffey had hitchhiked to London from Birkenhead and had been sleeping rough near Euston station for days before Nilsen offered him a bed for the night. A handful of unnamed victims followed over the next year, men picked up in pubs around Soho and Leicester Square. Then, in September 1981, Malcolm Barlow, 23, collapsed outside Nilsen's flat. Nilsen called an ambulance and got him to hospital. When Barlow came back later that day to thank the man who'd helped him, Nilsen killed him too.
By this point, the flat's floorboards were hiding more bodies than Nilsen could manage. The smell of decay drew flies and became impossible to mask, no matter how much insecticide and deodorant he used. So he began dismembering the remains and burning them in the garden on makeshift bonfires, crowning each one with an old car tyre to disguise the smell of burning flesh. Neighbourhood children sometimes watched from nearby gardens, assuming he was simply burning rubbish.
The Warnings That Were Missed
In November 1980, a young man named Douglas Stewart woke up in Nilsen's flat with his ankles bound to a chair and Nilsen's hands around his throat. Stewart fought free and went straight to the police. Officers took a statement, treated it as a lovers' quarrel that had gotten out of hand, and let it drop. There was nothing yet to connect it to, so nobody connected it to anything.
That gap, the years between the first murder and the arrest, says as much about the era as it does about Nilsen himself. Almost every one of his victims was homeless, transient, or otherwise on the margins of society: runaways, rough sleepers, men estranged from their families. Few had anyone checking in on them, and fewer still were ever reported missing. A killer who might have been caught after two or three murders in a more connected community instead had five years, partly because the people he targeted were the people least likely to be missed by the systems meant to protect them.
Cranley Gardens, Nowhere Left to Hide
In 1981, Nilsen's landlord decided to renovate 195 Melrose Avenue and paid him to leave. On 5 October, the day before he moved out, Nilsen burned the last of the bodies he'd stored there. His new home was a cramped attic flat at 23 Cranley Gardens in Muswell Hill, and this time, there was no garden to burn anything in.
He killed at least three more men there. He almost strangled a 19 year old student named Paul Nobbs in November 1981 but stopped himself partway through. In March 1982, John Howlett put up a real fight, grabbing at Nilsen's throat hard enough to leave finger marks that lasted more than a week. In May 1982, a 21 year old called Carl Stottor came closer to dying than anyone else who survived.
Nilsen strangled and then drowned him in the bath, and Stottor only woke up because Nilsen's dog, a mongrel named Bleep, kept licking his face, unaware her owner believed the man was already dead. Nilsen revived him, and days later walked him to a train station as if nothing had happened.
His final victim was 20 year old Stephen Sinclair, killed on 26 January 1983 while Nilsen played one of his records of the rock opera Tommy in the background. Sinclair had crepe bandages on his wrists from a recent suicide attempt, bandages Nilsen would later use to seal the plastic bags he stored the man's remains in. Without a garden, Nilsen turned to boiling body parts in a large cooking pot and flushing what remained down the toilet, a decision that would ultimately be his undoing.
The Blocked Drain That Ended It All
In early February 1983, tenants at Cranley Gardens started complaining about a blocked drain, Nilsen among them. On 8 February, a Dyno-Rod engineer named Michael Cattran opened the drain cover and found it packed with a strange, greasy substance and small bones. When he mentioned it looked like it could be human flesh, Nilsen, standing right there, replied without missing a beat that it was probably "someone's flushed their Kentucky Fried Chicken down there."
Cattran wasn't convinced, and when he returned the next morning to find the drain mysteriously cleared, he was even less so. He checked a pipe leading up to Nilsen's flat and found more flesh and bone fragments, ones that looked distinctly like they'd come from a human hand. The police were called in immediately.
Detective Chief Inspector Peter Jay waited outside the building until Nilsen came home from work. When told the drain contained human remains, Nilsen tried to act shocked, saying, "Good grief, how awful!" Jay wasn't having it. "Don't mess about," he said. "Where's the rest of the body?" Nilsen calmly told him there were two bags in his wardrobe, and asked to explain everything properly, at the station rather than the flat. On the drive there, asked how many people the remains belonged to, he stared out the window and said, "Fifteen or sixteen, since 1978."
"Fifteen or sixteen, since 1978."
Thirty Hours of Confession
Over the following days, police searched Nilsen's flat and found dismembered remains in a tea chest, a wardrobe, and a drawer under the bath. Nilsen talked. He talked for more than thirty hours across sixteen separate interviews, walking detectives through years of killings with an unsettling calm.
When they asked why he'd done it, he said, "I'm hoping you will tell me that." He described a private ritual that followed each killing: bathing the bodies, shaving them, applying makeup, dressing them, before eventually disposing of them. "I wished I could stop, but I couldn't," he told police. "I had no other thrill or happiness." He called what he'd done an art he'd worshipped.
"I wished I could stop, but I couldn't. I had no other thrill or happiness."
Old Bailey, the Battle Over a Killer's Mind
Nilsen's trial opened at the Old Bailey on 24 October 1983. Nobody disputed that he'd killed six of the men named in his charges, plus two attempted murders. The real fight was over his state of mind. Prosecutor Allan Green argued Nilsen had been sane and fully in control the entire time. Defence barrister Ivan Lawrence argued diminished responsibility, saying a severe personality disorder meant Nilsen couldn't be held fully accountable.
Some of the most striking testimony came from the men who'd survived him. Douglas Stewart described waking up bound to a chair with Nilsen strangling him, fighting him off, and how police at the time had written it off as a lovers' quarrel. Paul Nobbs recalled waking up with a splitting headache and Nilsen telling him, with total sincerity, "God! You look bloody awful!", a strange thing to say to someone he'd tried to kill hours earlier. Carl Stottor, visibly shaken on the stand, described the moment he realised he was being held under bathwater.
The defence's psychiatrists argued Nilsen suffered from a narcissistic personality disorder severe enough to blur his sense of what he was doing. The prosecution's own psychiatrist, who'd interviewed him sixteen times, disagreed, calling him manipulative but mentally sound. After twelve hours of deliberation, the jury convicted him on six counts of murder and one of attempted murder, and Justice Croom Johnson gave him life with a minimum of 25 years. Nilsen didn't appeal. He more or less agreed with the prosecution's account, later admitting the "enormous thrill" he'd taken from luring men home, deciding to kill them, and dealing with what came after.
Thirty Five Years Behind Bars
Nilsen served his sentence across several prisons, starting at HMP Wormwood Scrubs. In December 1983, another inmate slashed him across the face and chest with a razor, leaving him with 89 stitches. He was moved to HMP Parkhurst, then HMP Wakefield, where he stayed until 1990, before further moves to Full Sutton and Whitemoor as prison authorities juggled his safety against his Category A status.
In 1994, Home Secretary Michael Howard converted his 25 year minimum into a whole life tariff, guaranteeing he would die in prison. Nilsen accepted it without protest, spending his remaining years translating books into braille, painting, composing music, and writing letters to a steady stream of correspondents. He also wrote an unpublished 400 page autobiography called The History of a Drowning Boy, a title reaching back to that childhood moment at Inverallochy beach.
He died on 12 May 2018 at York Hospital, following complications from surgery, still officially an inmate of HMP Full Sutton, thirty five years after his arrest.
Why Dennis Nilsen Still Haunts Us
Nilsen's case has never really left the public imagination, partly because of how thoroughly it's been documented. Author Brian Masters spent years interviewing him in prison for Killing for Company, published in 1985, still considered the definitive account of the case and one of the books that shaped how true crime writing tackles the psychology of a killer rather than just the body count.
In 2020, ITV adapted it into Des, a three part drama starring David Tennant as Nilsen, with Daniel Mays as DCI Jay and Jason Watkins as Masters, praised for focusing on the investigation rather than dramatising the violence. A year later, Netflix released Memories of a Murderer: The Nilsen Tapes, built around prison audio recordings that let Nilsen, in his own voice, try to explain himself one more time.
What keeps drawing people back, more than forty years on, isn't really the murders themselves. It's the years in between them, all the ordinary, unremarkable days when Nilsen sat behind a Jobcentre desk, walked his dog, and went unnoticed by everyone around him.
This account draws on Old Bailey trial records, contemporaneous police statements, and Brian Masters' Killing for Company (1985), still considered the definitive study of the case.
Quick Questions About Dennis Nilsen
How many people did Dennis Nilsen kill?
He was convicted of six murders but confessed to killing twelve to fifteen men between 1978 and 1983, plus several attempted murders.
Where did Dennis Nilsen commit his murders?
Mainly at two London addresses: 195 Melrose Avenue in Cricklewood, then 23 Cranley Gardens in Muswell Hill.
How was Dennis Nilsen caught?
A blocked drain at Cranley Gardens led an engineer to find human remains in February 1983. Police arrested him within hours, and he confessed almost immediately.
Is there a TV show about Dennis Nilsen?
Yes. The ITV drama Des (2020), starring David Tennant, is the best known dramatisation, based on Brian Masters' book Killing for Company.
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