Richard's Speck's slaying of eight student nurses in 1966 Chicago shocked the nation.

Laurie "Bambi" Bembenek's attorney is seeking a posthumous pardon based on new forensic evidence.

New York's Joel Rifkin, who went on a rampage killing sex workers, is one of the most prolific serial killers.

Authorities credit citizen sleuths and cutting-edge DNA technology with helping them restore names and faces to the previously unknown victims.

Since 1947, the brutal death of 22-year-old Elizabeth Short has remained Hollywood’s most enduring unsolved mystery.

Hear are five wild theories about the unsolved 1996 death of hip hip legend Tupac Shakur.

On May 19, 1983, Diane Downs claimed that a stranger had shot her three children and herself in a carjacking.

Chris Watts, Patrick Frazee, Jayme Closs, Jessica Chambers. All names associated with heinous crimes and cases that have keep America enthralled and that have exposed the truly dark sides of human nature. See our rundown of 4 of the most gripping true crime cases from the last 10 years, only on Investigation Discovery.

Here are five things to know about the complex NXIVM sex cult case, Keith Raniere, and Allison Mack.

Here are five things to know about the bizarre kidnapping of newborn Kamiyah Mobley.