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An in-depth look at some of the world's most dangerous murderers.
S9, EP4 "Graham McGill"
Mary McLaughlin's unsolved murder was finally cracked after 36 years, exposing killer Graham McGill.
S8, EP17 "Colin Whelan"
When Mary Gough is found dead in her family home, her husband Colin Whelan appears shocked.
S8, EP16 "Joe O'Reilly"
Less than 20 minutes after dropping her children off at school, Rachel O'Reilly is murdered.
S9, EP1 "Adam Whelehan"
Young Natalie Jarvis was killed by Adam Whelehan, whose cruel and cowardly plot was exposed by investigators.
S10, EP20 "Barry Prudom"
In 1982, Barry Prudom sparked Britain's largest ever manhunt, murdering police officers and civilians.
S10, EP19 "Paul McNaughton"
In August 2022, retired teacher Peter Coshan vanished after meeting a man through a dating app in Edinburgh.
S10, EP18 "David Baxendale"
In May 2010, mother of three Sarah Thomas was stabbed to death in her Surrey home.
S10, EP17 "Tariq Rehman"
In February 1995, the city of Bradford in West Yorkshire was shaken to the core by the murder of two children.