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.

Find out why Joseph O’Boyle brutally killed his doctor, beloved chiropractor James Sowa, in his Bensalem, Pennsylvania, home, and how detectives found him.

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

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

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

What happened to the Memphis businessman?

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

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

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 ...

Learn more about how medical examiners determine the manner of death ahead of the Season 5 return of Oxygen's Accident, ...

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