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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.
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.
S6, EP3 "Jamie Reynolds"
A 23-year-old killer murders 17-year-old former head girl Georgia Williams in 2013.
S5, EP6 "Jason Marshall"
A look at the twisted killer who tortured and murdered a man in his home while filming it.
S9, EP5 "Anthony Russell"
A violent spree leaves three innocent people dead as Anthony robs, flees and attacks without hesitation; police launch a massive manhunt, racing to catch him before he could claim yet another victim.
