John Allen Muhammad
John Allen Muhammad is the person who, along with Lee Malvo, committed the series of sniper attacks in Washington, D.C., Maryland, and Virginia in 2002
John Childs
John Childs is a hitman confessed to killing six people in two separate documentaries.
John Cooper
John Cooper is a serial killer who committed several murders in the United States during the 1980s
John Duffy
John Duffy was a British serial killer and rapist known as one of the "Railway Killers," responsible for a series of attacks on women near railway stations in London during the 1980s. He committed his crimes alongside accomplice David Mulcahy. Duffy was eventually arrested and convicted, receiving a life sentence. His case was significant in the development of offender profiling techniques in the United Kingdom and remains one of the most notorious series of crimes in London’s history.
John Gotti
John Gotti was an American mob boss and criminal who served as the head of the Gambino crime family from 1985 until his incarceration in 1996