After Lt. William Walker succumbs to his injuries, investigators must find out who killed him and why.

A well-respected firefighter and loving family man is found gunned down outside his suburban home, sending police on a furious search for his killers. What they find stuns even the most hardened ...

Ezra McCandless tried to claim she stabbed her ex-boyfriend Alex Woodworth to death in self-defense. See what police decided happened.

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

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

A young woman seeks refuge at the home of a Wisconsin farmer, claiming she just escaped from a violent assault. When ...

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?

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.

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

After Leon Harrison Jr. disappears, a missing persons investigation leads to disturbing clues and reveals a toxic relationship.