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

Carla Walker's 1970s murder devastated her community until the killer was finally caught.

Gardener William Howell used his van as a "murder mobile," killing women and dumping bodies.

Christopher Halliwell's found guilty of murdering two women.

A 23-year-old killer murders 17-year-old former head girl Georgia Williams in 2013.