
An in-depth look at some of the world's most dangerous murderers.

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Billy Mansfield Jr. moved between Florida and Michigan, targeting vulnerable women and girls.
Mary McLaughlin's unsolved murder was finally cracked after 36 years, exposing killer Graham McGill.
In March 2005, the Gardaí recovered human body parts from the Royal Canal in Dublin.
In 1999 and 2000, John Eric Armstrong cruises the streets of Detroit looking for sex workers.