Serial killers are real-life nightmares.

This hotel hid secrets and bodies within its walls.

This deadly pair from 18th century America left a bloody trail across the frontier as they slaughtered men, women, and children to satisfy their bloodlust.

Peek inside their dark minds...

The semester from hell doesn’t even begin to describe it for these students.

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.