An Unexpected Killer

Patricia Kimmi vanished in November 2009, but investigators suspected foul play after discovering her dentures, a money clip covered in blood, and bloody coins not far from her Kansas home.

Samantha Lezark went looking for love in online chat rooms in 2003, but did her desire to find a new partner cost her life?

"An Unexpected Killer" returns to Oxygen with all new episodes, including one about the 1979 murder of Savannah Anderson.

Nicole VanderHeyden and her boyfriend, Doug Dietrie, were out with friends when they got in a huge fight and she stormed off. The next morning, her body was found brutalized in a field.

Jackie and Carl Gaimari had an untraditional but loving relationship when two burglars killed him in 1979. But 30 years later, her sister helped police prove there was more to the story.

Danielle Jennings went home for lunch in the middle of a tough work day. Her fiancé found her dead on their bed a few hours later.

When Florida grandmother Ann Trexler got mad that her daughter, Tina, might lose custody of her beloved grandchild, she worked with her hairdresser's boyfriend, Tony Perez, to make sure her former son-in-law could never go back to court.

When a Minnesota mom, Linda Jensen, was found brutally strangled and stabbed in her own bedroom, police had no viable suspects until a tip came in eight years later.

Pastor's wife Cynthia Borton was found murdered in her own kitchen in 1988. Who killed her, and why?

When Gonzalo Pizano-Guzman was found dead in a ditch and his car was burned, no one could understand why someone would want a happy, hard-working young man dead months before his wedding.