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Angus Sinclair is a serial killer responsible for multiple murders, as depicted in various documentaries.
Mark Hobson is a killer as depicted in World's Most Evil Killers - Season 3, Episode 10 and The Horrific Crimes of Mark Hobson.
Christopher Halliwell is a British serial killer convicted for the murder of Sian O'Callaghan and Becky Godden-Edwards.
David Heiss is a murderer who was the subject of World's Most Evil Killers in Season 3, Episode 15.
Christopher Hightower is a murderer featured in World's Most Evil Killers - Season 4, Episode 3 (2021)
Angel Resendiz, also known as The Railroad Killer, is a convicted serial killer responsible for multiple murders in the United States from 1986 to 1997.
Stephen Farrow is featured in this episode as a killer, specifically from World's Most Evil Killers - Season 5
Russell Bishop is a convicted murderer responsible for the 1986 killings of two young girls, known as the 'Babes in the Wood' case
Jason Marshall is featured in 'World's Most Evil Killers' season 5 episode 3, implying he committed a series of murders.
Phillip Austin is a killer featured in World's Most Evil Killers - Season 5, Episode 1 (2021)
Colin Pitchfork is a convicted murderer in the United Kingdom who was found guilty of killing two girls, Nicole and Kay, in the late 1980s.
Keith Jesperson is a notorious serial killer known as the 'Happy Face Killer' responsible for multiple murders in the U.S.
Jesse Matthew is a convicted murderer, primarily known for the abduction and murder of Hannah Graham in 2014.
Chester Turner is a serial killer convicted for the murders of multiple women in California during the late 1980s and early 1990s.
Judy Buenoano is a convicted killer who was dubbed 'The Black Widow' for her series of murders and insurance scams from the mid-1970s to the late 1980s.
Geoffrey Evans is a subject in the World's Most Evil Killers series, indicating he is likely a convicted murderer.
Zahid Zaman is the leader implicated in a series of crimes, as per 'The Ring Leader of Death', a true crime documentary from 2023.