John Walsh profiles John Blauvelt, a troubled U.S. Army vet who is accused of waging a lethal war against his young wife. Later, Callahan looks at Rudy Fernandez, whose teen romance with his high school sweetheart is believed to have turned deadly.

John Walsh investigates how Eric Jones, the son of a preacher, allegedly turned to murder; Callahan Walsh tries to make sense of how a dispute over a dog could provoke Ricardo Villanueva Cordova to reportedly commit murder in broad daylight.