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

In 1999 and 2000, John Eric Armstrong cruises the streets of Detroit looking for sex workers.

A Texas serial killer, Anthony Allen Shore was matched to four murders after his arrest for a different crime.

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.