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

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

Uloma Curry-Walker wanted her husband, William Walker, dead. Learn how she had him murdered right after they married.

A young woman seeks refuge at the home of a Wisconsin farmer, claiming she just escaped from a violent assault. When investigators arrive at the crime scene, they make a tragic discovery that will ...

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

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

Investigators discover Bill and Nancy Mueller's trailer and Jeep abandoned in rural Arkansas, with no sign of the family to be found.

Leon Harrison Jr., a loving father, goes missing. What happened to him that ultimately revealed his untimely death?

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

Investigators and loved ones speak out on Ezra McCandless's violent nature.

Bill Mueller meets a single mother, Nancy, and they quickly form a seemingly perfect relationship.

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