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Examining some of the most dangerous and prolific murderers in the UK and worldwide.
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.
S5, EP8 "Colin Pitchfork"
Colin Pitchfork is the first person to be convicted of murder based on DNA fingerprinting evidence.
S5, EP7 "Sabah Khan"
A woman murders her sister after developing a deadly obsession with her brother-in-law.
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.
S9, EP8 "Johnny Miller"
Charlotte vanishes before her birthday and Johnny feeds her family lies to hide the truth; the police slowly piece together her final days, uncovering that Johnny killed her while the search for her remains continued.
S9, EP2 "Gavin McGuire"
Teen Mhairi is killed on her walk home after a festive night; investigators trace her last steps, using CCTV and forensics that point to Gavin, a violent repeat offender whose history reveals how dangerous he truly is.
