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An in-depth look at some of the world's most dangerous murderers.
S7, EP1 "Stephen Unwin & William McFall"
After striking up a friendship in prison for previous murders, Stephen Unwin and William McFall's release had awful consequences.
S8, EP9 "Billy Mansfield Jr."
Billy Mansfield Jr. moved between Florida and Michigan, targeting vulnerable women and girls.
S6, EP20 "Genene Jones"
A serial killer works as a nurse in Texas, where she kills many children and infants by injecting them with drugs.
S8, EP13 "Jordan Monaghan"
Jordan Monaghan kills his 24-day-old daughter Ruby on New Year's Day in January 2013.
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.
