Mark of a Serial Killer

In the 1990s, women were found dead in homes that had been set on fire across Chicago.

Between 1993 and 1998, a Chicago serial killer preyed upon women in the Englewood community.

Three women found dead in the Seattle area had ties to the nightclub scene — and so did their killer.

The so-called "I-95 Killer" pursued gay men and placed items like leaves, socks, and sex toys in their mouths after their brutal murders.

Steven Brian Pennell, also known as the "Route 40 Killer," picked women up off the highway before torturing and killing them.

Several serial killers wouldn’t leave the scene of the crime without taking something — be it a body part or a piece of jewelry — from the victim.

Serial Killer Week is a nine-night special event running from Saturday, April 10 to Sunday, April 18 on Oxygen.

Serial Killer Week, a nine-night event on Oxygen this April, is diving into the most notorious serial killers of all time.

Since the 1950s, hundreds of bodies have been found off America’s highway system, including most of the victims of the Colonial Parkway murders.

With calling cards and signatures, these serial killers let the world know they were behind some of the sickest crimes imaginable.