Serial killers are real-life nightmares.

Can the Disney heartthrob make the transition to cold-blooded killer?

He seemed have everything going for him ... but darkness lurked beneath the surface.

Don't let him in.

Did the sadistic "Murder Castle" serial killer fake his own death in 1896?

These sadistic killers shocked the world with their horrific crimes.

Here are seven little-known killers of the 19th century.

Serial killer Peter Tobin has three known victims: but was this depraved killer also responsible for the unsolved Bible John murders of the 1960s?

John Wayne Gacy AKA "The Killer Clown" raped and murdered at least 33—crimes he died for in 1994. These are the rarely-discussed details of his life.

A con artist killer and his unsuspecting victims.

Think you know everything about the most infamous serial killers the world has ever produced? 

Here's where they go after they're gone for good...

Get your true crime fix.

An inquiry into his sinister activities concluded that he killed at least 215 of his patients.

Belle Gunness lured numerous suitors to her Indiana murder farm, where she killed them in cold blood and dumped their bodies in a hog pen.

Remembering the victims of this brutal murder spree.