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Examining some of the most dangerous and prolific murderers in the UK and worldwide.
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, EP9 "Ali Qazimaj"
A double murderer is found guilty of the brutal assassination of an elderly couple.
S5, EP10 "Billy Dunlop"
A profile of the killer who, after killing 22-year-old Julie Hogg, became the first person to be convicted under revised UK double-jeopardy laws.
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, 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.
