Stephen Griffiths, the self-proclaimed Crossbow Cannibal, had always fantasized about murder. In 2009, he acted on his murderous instincts and killed three women.
A chilling profile of the father who took his two young children for fish and chips after murdering his wife, and then strangling them when they returned home.
Diane Downs shot her three children, killing her seven-year-old daughter Cheryl and wounding her other two children.
The story of Malcolm Green, who was jailed for life for murder, only to kill again when he was released.
Stuart Hazell had sexually assaulted and murdered Tia, his partner's twelve-year-old daughter.
Daniel Siebert was an American serial killer who confessed to killing ten people in the 80s. At the height of his killing spree, he murdered five people, including two children and his girlfriend.
The story of the Baton Rouge Serial Killer, known for murdering seven women and sentenced to death.
Sante and her 23-year-old son Kenny Kimes were a murderous duo who killed three people in the late 90s, including an 82-year-old woman.
Jorge Torrez was a prolific predator capable of carrying out heinous and horrific acts.
Fred and Rose West raped, tortured and killed young women in their house of horrors, including their own daughter.
Bill Suff mutilated and murdered twelve sex workers in Riverside, California during the late 80s. At its peak, his spree of killings resulted in a victim a month.
Wayne Adam Ford is an American serial killer who strangled and dismembered three of his four victims.
An investigation into the woman who was driven into a jealous rage and stabbed her sister to death while her children slept upstairs.
Deadly consequences come from a friendship between two murderers who met in prison.
Between 1989 and 1992 in East Germany, Wolfgang Schmidt, known as the Beast of Beelitz, murdered four women and a baby.
Vincent Tabak strangled his neighbour to death in her own flat in December 2010. In 2011, he was given a life sentence.
Stuart Campbell was convicted of the murder of his 15-year-old niece in 2002.
Thierry Paulin murdered 21 elderly women during the 1980s. He lived a lavish lifestyle, funded by the money stolen from his victims.
The story of 27-year-old Pawel Relowicz, who raped and killed 21-year-old Hull student Libby Squire.
In December 1998, Angel Resendiz brutally beat Dr. Claudia Benton to death in her own home. He's suspected of murdering at least nine more people and evaded authorities by using multiple aliases.