Constanzo was convinced he could protect his criminal operation through ritual murder.
It's one of the most shocking crimes imaginable...
Did you know that Laura Palmer's death was inspired by a real-life murder case?
He seemed have everything going for him ... but darkness lurked beneath the surface.
Gypsy was a murderer, investigators say, but she was also a victim of Munchausen syndrome by proxy.
Did the sadistic "Murder Castle" serial killer fake his own death in 1896?
Her death remains one of the most mystifying cold cases in the state of Arkansas.
Wait ... what was that noise?
Her badly beaten body was sprawled out on her dorm room floor.
Serial killer Peter Tobin has three known victims: but was this depraved killer also responsible for the unsolved Bible John murders of the 1960s?