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Examining some of the most dangerous and prolific murderers in the UK and worldwide.
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.
S5, EP6 "Jason Marshall"
A look at the twisted killer who tortured and murdered a man in his home while filming it.
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, 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.
