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An in-depth look at some of the world's most dangerous murderers.
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.
S7, EP9 "Ian Stewart"
Jailed for the dreadful murder of a children's author, Ian Stewart receives a second conviction for the death of his wife, six years earlier.
S8, EP15 "Nicholas Burton"
In April 1997, 27-year-old Rachel McGrath is stabbed to death by an unknown attacker in a car park.
S9, EP20 "Charles Cullen"
Nurse Charles Cullen secretly killed patients for years while avoiding scrutiny.
S9, EP19 "Joel Rifkin"
A traffic stop revealed a body, exposing Joel Rifkin's deadly spree against vulnerable women.
S9, EP18 "Westley Allan Dodd"
Westley Allan Dodd's escalating predation ended after he murdered three young boys.
S9, EP17 "Emanuel Webb"
A decade-old link revealed a serial killer who kept the same M.O. after moving far away.
