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Examining some of the most dangerous and prolific murderers in the UK and worldwide.
S5, EP6 "Jason Marshall"
A look at the twisted killer who tortured and murdered a man in his home while filming it.
S5, EP7 "Sabah Khan"
A woman murders her sister after developing a deadly obsession with her brother-in-law.
S6, EP4 "Sarah Williams & Katrina Walsh"
Sarah Williams and Katrina Walsh, the two friends carry out the jealousy-fuelled murder of Sadie Hartley.
S6, EP7 "Daniel Gonzalez"
The story of a killer who took four lives during a chilling two-day killing spree in 2004 after being inspired by horror films.
S6, EP10 "Malcolm Green"
Malcolm Green is jailed for life for the brutal murder of a Cardiff prostitute; he kills again when he is released after 18 years.
S6, EP9 "Mark Martin: The Sneinton Strangler"
The story of Mark Martin, who murdered three homeless women in his quest to become Nottingham's first serial killer.
S6, EP8 "Geoffrey Evans & John Shaw"
Geoffrey Evans and his accomplice John Shaw hit headlines in 1976 after the murders of two women in Ireland.
S6, EP7 "Daniel Gonzalez"
The story of a killer who took four lives during a chilling two-day killing spree in 2004 after being inspired by horror films.
