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

The first woman executed by lethal injection after taking six lives.

Ali Qazimaj is an Albanian conman who brutally murdered an elderly couple in 2016.

Over a 25-year career of murder, Richard Biegenwald killed at least six people.

A profile of Richard Roszkowski, the Connecticut triple-murderer who killed his ex-girlfriend, her nine-year-old daughter and another man in a brutal attack in 2006.