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

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

In 1991, Gregory Green stabbed his first wife to death, killing not only her but also their unborn child.

In 1991, the bodies of sex workers started being discovered in Detroit, Michigan.

After two couples were brutally murdered three years apart, both cases went cold for almost three decades.