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

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

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 ...

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

When a convicted felon is found to be in possession of Bill Mueller's gun, he shares a description of the people he purchased it from.

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?

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.