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

Four vicious murders put Mark Hobson at the center of a nationwide manhunt. Criminologists and psychologists try to decode this enigma.

Born in El Paso, Texas, on February 29, 1960, Richard Ramirez was an American serial killer who over a two-year rampage raped and tortured more than 25 victims and murdered more than a dozen, most of them in their own homes.

In August 1990, Danny Rolling murders five college students in Gainesville, Fla., home of the University of Florida, and creates gruesome crime scenes that are designed to shock.

In 1987, American serial killer Daniel Siebert is given two death sentences for killing vulnerable people across America.