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

"Mark of a Killer" is looking back on the mementos and calling cards of some of the most horrific serial killers in U.S. history.

Serial killer Derrick Todd Lee was tied to seven brutal Louisiana murders through DNA evidence in 2003.

While speaking with investigators, Dennis Rader opened up about defining moments in his childhood that hinted at his future as the BTK serial killer.