Dennis Andrew Nilsen (23 November 1945 – 12 May 2018) was a Scottish serial killer and necrophile who murdered at least twelve young men between 1978 and 1983 in London, England. Convicted at the Old Bailey of six counts of murder and two of attempted murder, Nilsen was sentenced to life imprisonment on 4 November 1983, with a recommendation that he serve a minimum of 25 years. In his later years, he was incarcerated at Full Sutton maximum security prison.
All of Nilsen’s murders were committed in the two North London addresses in which he resided between 1978 and 1983. His victims would be lured to these addresses through guile and killed by strangulation, sometimes accompanied by drowning.
Following each murder, Nilsen would observe a ritual in which he bathed and dressed the victim’s body, which he retained for extended periods of time, before dissecting and disposing of the remains by burning on a bonfire or flushing down a lavatory.
Nilsen became known as the Muswell Hill Murderer, as he committed his later murders in the Muswell Hill district of North London. He died in prison on 12 May 2018.