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

Scottish serial killer Robert Black attacked four young girls between 1981 and 1986; he was sentenced to life imprisonment at HMP Maghaberry with a minimum sentence of 35 years and was linked to 13 other child murders.

Keith Jesperson, known as the Happy Face Killer, brutally killed at least eight women across five American states in the early 1990s.

Christopher Halliwell's found guilty of murdering two women.

Dennis Rader, known to the world as the BTK Killer, killed ten people, including young children, between 1974 and 1991 in Wichita, Kansas.