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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.
S5, EP9 "Ali Qazimaj"
A double murderer is found guilty of the brutal assassination of an elderly couple.
S6, EP3 "Jamie Reynolds"
A 23-year-old killer murders 17-year-old former head girl Georgia Williams in 2013.
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, 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.
