Serial killer Dennis Nilsen was turned on by his bully's washed-up body, a forensic psychologist claims.
Kerry Daynes has spoken with some of the world's most evil criminals from killers to paedophiles in their respective prisons and hospitals.
Scottish Nilsen who murdered at least 12 young men and boys in London between 1978 and 1983, was one of her interviewees.
Before his death in 2008, Kerry met Nilsen behind bars and clearly left an impression, because he soon after began calling her for long chats over the phone.
Rather than ringing for a general catch-up and asking how Kerry was doing, she says he only ever spoke about himself and his wicked deeds.
She said: "Dennis loved to complain. He was a narcissist and just wanted to talk about himself all the time.
"He was always very keen to talk about his offending which is of course really grisly."
The way Nilsen appeared to get off on reliving memories of his heinous crimes was enough for Kerry to often shut him up, The Sun reports.
She continued: "I remember him telling me in explicit detail how to dismember a body and of course he was a trained butcher.
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"He would want to go into detail but I'd have to stop him because I felt it was his way of re-enacting the crime and sustaining his fantasy.
"And he did say he found it difficult and if he could go back and do it again he would as it was a consistent fantasy that stayed with him and a consistent need to have a dead body i.e. a completely passive partner as he saw it."
As well as trying to tell Kelly as much as he could about his murders, Nilsen opened up about his childhood.
One particularly disturbing revelation which helped explain his necrophilia came when at the sea and a dead boy had been dragged ashore.
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Kelly added: "He'd talk about being gay and being effeminate growing up in this little Scottish village and having to hide his sexuality, which I thought was really significant.
"He also said about how he saw one of the bullies being pulled from the sea after he drowned and he thought 'well he's not going to bully me again, he's got no control, he's dead'.
"That gave him a real sense of satisfaction but he also felt sexually attracted towards the body of this boy. You can see how his very twisted sexual development occurred."
What Lies Buried: A forensic psychologist's true stories of madness, the bad and the misunderstood by Kerry Daynes is published today by Endeavour.
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