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Examining some of the most dangerous and prolific murderers in the UK and worldwide.
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.
S5, EP8 "Colin Pitchfork"
Colin Pitchfork is the first person to be convicted of murder based on DNA fingerprinting evidence.
S6, EP6 "Pawel Relowicz"
Pawel Relowicz rapes and kills 21-year-old Hull student Libby Squire in a case that made headlines around the UK.
S5, EP7 "Sabah Khan"
A woman murders her sister after developing a deadly obsession with her brother-in-law.
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, EP6 "Pawel Relowicz"
Pawel Relowicz rapes and kills 21-year-old Hull student Libby Squire in a case that made headlines around the UK.
S6, EP5 "Lee Ford"
Lee Ford kills his wife and four stepchildren in a cold-blooded murder spree over 24 hours in September 2000.
S6, EP4 "Sarah Williams & Katrina Walsh"
Sarah Williams and Katrina Walsh, the two friends carry out the jealousy-fuelled murder of Sadie Hartley.
