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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, EP1 "Stephen Farrow"
A profile of the double-murderer who killed a 77-year-old teacher and a 59-year-old reverend.
S5, EP8 "Colin Pitchfork"
Colin Pitchfork is the first person to be convicted of murder based on DNA fingerprinting evidence.
S5, EP9 "Ali Qazimaj"
A double murderer is found guilty of the brutal assassination of an elderly couple.
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, 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, EP6 "Pawel Relowicz"
Pawel Relowicz rapes and kills 21-year-old Hull student Libby Squire in a case that made headlines around the UK.
