Serial Killers

In 1969, Hollywood was at the center of the brutal and sadistic killing spree of Charles Manson and his cult of followers. Today, the sites of these horrific murders are host to claims of the paranormal.

Since the '70s, the United States has produced an estimated 1,400 serial killers -- double the combined total of the rest of the world. What causes a seemingly normal human being to engage in serial acts of murder?

Voices and visions reveal the shocking truth behind H.H. Holmes' three-story, block-long hotel designed with trap doors, gas chambers, and vats of acid for serial murder.

The Great Depression forced thousands from their homes and into makeshift shantytowns. There Mad Butcher of Kingsbury Run found his victims in one of the most baffling unsolved crimes of the 20th century.

Hurricane Katrina changed New Orleans forever. But was the storm of the century also responsible for a perfect storm of hungry spirits and vulnerable prey that led an Iraq War vet to commit a heinous, shocking crime?

Unsolved murders. Cryptic clues. A dead end at every corner. The killer known as the Zodiac was never caught, but groundbreaking new DNA technology may bring investigators one step closer to solving the mystery.