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Examining some of the most dangerous and prolific murderers in the UK and worldwide.
S5, EP4 "Russell Bishop"
A look at the man convicted of sexually assaulting and murdering two nine-year-old girls in 1986.
S6, EP2 "Trimaan Harry Dhillon"
A killer attacks his ex-girlfriend in a jealous frenzy and commits a brutal murder after a campaign of harassment.
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, 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, EP4 "Sarah Williams & Katrina Walsh"
Sarah Williams and Katrina Walsh, the two friends carry out the jealousy-fuelled murder of Sadie Hartley.
S6, EP2 "Trimaan Harry Dhillon"
A killer attacks his ex-girlfriend in a jealous frenzy and commits a brutal murder after a campaign of harassment.
