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

After striking up a friendship in prison for previous murders, Stephen Unwin and William McFall's release had awful consequences.

In March 2005, the Gardaí recovered human body parts from the Royal Canal in Dublin.

Billy Dunlop killed Julie Hogg in 1989 but was acquitted after two failed trials.

In 2007, single mother of three Paige Birgfeld goes missing.