
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.

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.