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

Nurse Charles Cullen secretly killed patients for years while avoiding scrutiny.

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

A serial killer and rapist who murdered at least 23 men and boys, this is the little-known case of Ronald Dominique.

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