Rodney James Alcala, the aptly-named “Dating Game Killer,” appeared on and won an episode of The Dating Game during his killing spree.

Handsome Ted, the crazy necrophile.

Andrei Chikatilo, The Butcher.

Jeffrey Dahmer, The Cannibal.

Pedro Rodriguez Filho, The Brazilian Maniac.

The original killer clown.

Luis Garavita, aka: The Beast.

John George Haigh, The Acid Bath Killer.

Over 50 rapes and a dozen murders...and he could still be out there.

Maybe the most infamous serial killer of all time. Who was he? Why did he do what he did?

Maybe America's most infamous cult leader/mass murderer.

Tsutomu Miyazaki, aka: The Human Dracula.

Alexander Pichushkin, The Chessboard Killer.

Dennis Rader, or as he is more famously known, "BTK."

Ahmad Suradji, aka: The Sorcerer

AIleen Wuornos, The Monster.

The killer who terrified the west coast and taunted police with coded messages, many of which remain uncracked to this day.
The Zodiac Killer, if still alive, still roams the streets today.  In northern California in the late 60s and early 70s, he injured 2 people, killed 5, but claims to have killed 37.  He taunted police with 4 cryptograms, with only 1 being totally solved.  Any theories on his identity (apart from Ted Cruz)?