When Georgia grandmother Toni Abad agreed to give a young woman a car ride, she unknowingly opened the door to her own grisly murder.

The disappearance of Jeffrey and Jeanette Navin shocks a Connecticut town and leads detectives to a fatal family plot.

After a child played a prank on him, Mark and Dustin Spotz got into a violent argument that sent Mark on the run with his 17-year-old girlfriend.

Bradley Martin was participating in a work-release program while in prison when he met Carolyn King, a married mom of four. Together, the two embarked on a gruesome crime spree.

By allegedly faking a pregnancy, Kaleigh Fryer convinced her older boyfriend he needed to kill her father so they could be a family.

In the fall of 2017, 76-year-old Frank Stonemark vanished. The missing persons case led detectives to a gruesome murder.

"Killer Couples” kicks off its latest season with the story of a deadly Hawaiian love triangle.

Prep for the return of "Killer Couples" this May by watching each and every episode about murderous lovers.

The Season 15 premiere of "Killer Couples" takes a deep dive into a deadly love triangle in Hawaii.

Allan Lanteigne was found bludgeoned to death at his home in Toronto after his alarm system had been deactivated.