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Examining some of the most dangerous and prolific murderers in the UK and worldwide.
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, EP8 "Geoffrey Evans & John Shaw"
Geoffrey Evans and his accomplice John Shaw hit headlines in 1976 after the murders of two women in Ireland.
S5, EP6 "Jason Marshall"
A look at the twisted killer who tortured and murdered a man in his home while filming it.
S5, EP3 "Kenneth Regan & William Horncy"
The shocking story of the two men who murder a millionaire and three generations of his family in a vicious, greed-fueled attack.
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.
