Dennis Nilsen, a Scottish serial killer and necrophile responsible for the deaths of at least 12 young men and boys between 1978 and 1983, was also a dog lover. He bought his black and white dog from a pet shop in the mid-70s and named her Bleep, home videos show Nilsen lovingly playing with the puppy. A shy and trusting dog, Bleep remained Nilsen's companion through his murder spree, she may have witnessed murder, necrophilia and dissection and smelt the burning corpses on the bonfires Nilsen used to dispose of his victims. Bleep even saved the life of one of Nilsen's victims; licking semiconscious Carl Stotter awake after Nilsen had attempted to strangle and drown him, Nilsen later let Stotter live. Nilsen told police that Bleep would become frightened of him when he was on his 'high' and would hide and greet him the next morning as though he had been away. He would also sometimes wake up in the morning and be surprised to see a dead body but knew he needed to take Bleep for a walk before coming home and dealing with it. It was said that the dog added some normality to his life.

When Nilsen was arrested Bleep was sent to Battersea Dogs Home in a cage displayed her name incorrectly as Blip due to difficulty understanding Nilsen's thick Scottish accent. Bleep was never re-homed and was put to death three weeks later. Nilsen was informed of his beloved pet's death and said: “I’m ashamed that her last days should be so painful. She had always forgiven me everything, and nothing but me could ever break her heart. She never let me down, but in the moment of her greatest crisis I was not there.”

Eugene Butler was an American serial killer who murdered 6 teenage boys at his home in North Dakota, the USA between 1900-1906.

Butler was born in 1840 and came from a rich family. As an adult, he was said to be reclusive and to avoid contact with people. He began showing signs of mental illness such as hallucinations and was admitted to North Dakota State Hospital in 1906. In October 1913, Butler died while in the asylum.

After Butler's death, his estate was given to his living relatives. In 1915, workmen went to excavate his property. One of these workmen was digging under a cellar when he discovered skeletons, all of which had their skulls crushed and two of which had their legs broken. Locals were confused as nobody could recall anyone being reported missing or disappearing during the time period in question.

Police later revealed the skeletons all to be young men between 15 and 18, none of the individuals could be identified and it was suggested they had been vagrants employed to work on the farm by Butler.