Learn more about the investigation into Michigan man Trent Mallory's 2014 murder, as told in Oxygen's Killer Relationship.

The 2013 slaying of a beloved businessman in Washington state helped federal officials not just uncover another man’s disappearance some 800 miles away, but led them to a group of violent men ...

Dr. Jim Sowa is killed by his patient, Joey O'Boyle, who had a history of violence and mental health struggles.

Preview: It is quickly discovered that Carmela Knight died from blunt-force trauma before being badly burned in a house fire.

What happened to the Memphis businessman?

Investigators find a partially packed suitcase in Joey O'Boyle's home.

Detectives reveal the weather was vital in Trent Mallory’s case.

After Uloma Curry-Walker's frantic 911 call, firefighters on the scene recognize Lt. William Walker, a fellow firefighter.

Learn more about Patricia McDermott's fatal shooting in Philadelphia, and what police later found out about her killer Juan ...

Season 3 Preview: "Trader Trent's" following on Facebook Marketplace opened up a range of possibilities for detectives.

Learn more about Joyce Mitchell's life after helping Richard Matt and David Sweat escape from the Clinton Correctional ...

Preview: Carmela Knight, a "suburban hockey mom", was found dead after a house fire surrounded by drug paraphernalia. What happened?