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Examining some of the most dangerous and prolific murderers in the UK and worldwide.
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, 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.
S5, EP7 "Sabah Khan"
A woman murders her sister after developing a deadly obsession with her brother-in-law.
S5, EP8 "Colin Pitchfork"
Colin Pitchfork is the first person to be convicted of murder based on DNA fingerprinting evidence.
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.
