Delve into what turns someone into a killer. Whether it was premeditated or spontaneous, a revenge plot or the killer simply snapped, experts uncover the true story behind each killer from the very beginning.
...The Killer Within. Kim Edwards and Lucas Markham: 14-year-old Kim teamed up with her boyfriend to kill her own mother and sister in cold blood - but why? (S1, ep 1)
Rodrigo Hernandez - The Grand Rapids Killer: What drives a man to murder a stranger? Detectives reflect on the case of Hernandez, who did just that. (S1, ep 2)
Ahmed Al Khatib - A Matter Of Honour: What drives a man to kill his wife? Ahmed Al Khatib blamed evil spirits as he plotted to get away with murder. (S1, ep 3)
Shawn Grate - The Charismatic Killer: Described as charming, detectives saw another side to Shawn Grate when they found two decomposing bodies in his home. (S1, ep 4)
Charles Cullen - Killing For Kindness: The story of the nurse who confessed to murdering up to 40 patients during his 16-year career. (S1, ep 5)
Killer Women - Antoinette Frank - The Killer Cop: She was trusted to protect the community as a police officer, but ended up committing one of the worst crimes imaginable. (S1, ep 6)
Wilbern Cooper - The Ordinary Man: A look at how Wilbern Cooper was able to live a normal life for 28 years, knowing he had brutally killed a person. (S1, ep 7)
Ellis, Gregory, Martin & Simms - The Brotherhood's Revenge: A feud between two rival Birmingham gangs comes to a head when two innocent teenage girls are killed. (S1, ep 8)
Kouider & Medouni - The Nanny Murder: The shocking story of the murder of French au pair Sophie Lionnet at the hands of the couple she worked for. (S1, ep 9)
Barbara Coombes - A Daughter's Revenge: 12 years after murdering her 87-year-old father in an act of revenge, Barbara turned herself in. What drove her to kill? (S1, ep 10)