Harold Shipman — Doctor Death

Harold Frederick Shipman was a British general practitioner who is believed to have killed approximately 250 patients over a 23-year period, making him the most prolific serial killer in recorded history. He murdered his predominantly elderly, female patients by injecting lethal doses of diamorphine, typically forging death certificates to record natural causes. Shipman was not caught until 1998, when suspicions about the death of Kathleen Grundy and the alteration of her will prompted investigation. He was convicted of 15 murders in 2000 and hanged himself in his prison cell in January 2004.