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

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Gardener William Howell used his van as a "murder mobile," killing women and dumping bodies.
When Mary Gough is found dead in her family home, her husband Colin Whelan appears shocked.
The Alaska serial killer Robert Hansen who murdered at least seventeen women during a spree that lasted for more than a decade.
John Wayne Gacy murdered 33 boys and young men during a six-year period in the 1970s; he was well-liked in the community he lived in and would often dress up for kids' parties, earning himself the nickname Killer Clown.