
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.
In April 1997, 27-year-old Rachel McGrath is stabbed to death by an unknown attacker in a car park.
The Alaska serial killer Robert Hansen who murdered at least seventeen women during a spree that lasted for more than a decade.
When Mary Gough is found dead in her family home, her husband Colin Whelan appears shocked.