Find out why James Henrikson had Doug Carlile fatally shot in his Washington state home, and how Henrickson was linked to Kristopher Clarke's disappearance.

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

What happened to the Memphis businessman?

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

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

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

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

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

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

Alex Sowa, Jim Sowa's son, tearfully recalls finding his father's body.

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

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