Victims: 250, between 1975 and 1998.
Harold Shipman was a British doctor and is one of the most prolific serial killers in modern history, not just in Britain but anywhere in the world, killing hundreds of patients with lethal injections of drugs which he had easy access to. Most of his victims were elderly patients in his care, though there is suspicion that he may have killed patients as young as 4-years-old.
In March 1998 police looked into Shipman after someone expressed concerns to the coroner about the high death rate among Shipman’s patients. However the police were unable to find sufficient evidence and the investigation was closed on 17th April that same year. Shipman then went on to kill 3 more people before eventually being caught after trying to forge a will of one of his victims. The will excluded the victims family and left £386,000 to Shipman. However, the victims daughter became suspicious of this and went to the police, who then began another investigation into Shipman, and he was arrested on 7th September 1998.
Harold Shipman died by hanging himself in his cell on 13th January 2004.