Diagnoses : Psychological : Psychotic Episode

Dennis Andrew Nilsen (23 November 1945 – 12 May 2018) was a Scottish serial killer and necrophile who murdered at least twelve young men and boys between 1978 and 1983. 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; this recommendation was later changed to a whole life tariff in December 1994. In his later years, Nilsen was imprisoned at HM Prison Full Sutton in the East Riding of Yorkshire.
All of Nilsen's murders were committed at the two North London addresses where he lived between 1978 and 1983. His victims would be lured to these addresses through deception and killed by strangulation, sometimes accompanied by drowning. Following each murder, Nilsen would perform 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 them in a bonfire or flushing them down a toilet.
Nilsen became known as the Muswell Hill Murderer, as he committed his later murders in the Muswell Hill district of North London. He died at York Hospital on 12 May 2018 of a pulmonary embolism and a retroperitoneal haemorrhage, which occurred following surgery to repair an abdominal aortic aneurysm.

Kristen Heather Gilbert (née Strickland; born November 13, 1967) is an American serial killer and former nurse who was convicted of four murders and two attempted murders of patients admitted to the Veterans Affairs Medical Center (VAMC) in Northampton, Massachusetts. She induced cardiac arrest in patients by injecting their intravenous therapy bags with lethal doses of epinephrine, commonly known as adrenaline, which is an untraceable heart stimulant. She would then respond to the coded emergency, often resuscitating the patients herself. Prosecutors said Gilbert was on duty for about half of the 350 deaths that occurred at the hospital from when she started working there in 1989, and that the odds of this merely being a coincidence was 1 in 100 million. However, her only confirmed victims were Stanley Jagodowski, Henry Hudon, Kenneth Cutting, and Edward Skwira.

Émile Louis (21 January 1934 – 20 October 2013) was a French bus driver and the prime suspect in the disappearance of seven young women in the Yonne department, Burgundy, in the late 1970s. He confessed to their murders in 2000 but retracted this confession one month later. Louis was sentenced to life in prison by the cour d'assises of Yonne in 2004. The sentence, which was upheld on appeal in 2006, was confirmed by the Court of Cassation in 2007.

Patrick Wayne Kearney (born September 24, 1939), also known as The Trash Bag Killer and The Freeway Killer, is an American serial killer and necrophile who murdered a minimum of twenty-one young men and boys throughout southern California between 1962 and 1977.

Sean Richard Sellers (May 18, 1969 – February 4, 1999) was an American triple murderer, one of 22 persons in the United States since the reinstatement of the death penalty in 1976 to be executed for a crime committed while under the age of 18, and the only one to have been executed for a crime committed under the age of 17. His case drew worldwide attention due to his age as well as his jailhouse conversion to Christianity and his claim that demonic possession made him innocent of his crimes.

Sergeant François Bertrand (1823–1878), known as the Vampire of Montparnasse, was a sergeant in the French Army. He was arrested in 1849 for necrophilia and jailed for one year. In 1856, he moved to Le Havre. In his later life, he worked as clerk, mailman, and lighthouse keeper. He died on 25 February 1878.