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Examining some of the most dangerous and prolific murderers in the UK and worldwide.
S6, EP4 "Sarah Williams & Katrina Walsh"
Sarah Williams and Katrina Walsh, the two friends carry out the jealousy-fuelled murder of Sadie Hartley.
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, 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.
S5, EP6 "Jason Marshall"
A look at the twisted killer who tortured and murdered a man in his home while filming it.
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, 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, EP3 "Jamie Reynolds"
A 23-year-old killer murders 17-year-old former head girl Georgia Williams in 2013.
