In 1982, JoAnn Tate, 35, is stabbed to death in her home in St Louis, and her children, Melissa, 7, and Renee, 4, are left critically injured; Melissa identifies the attacker but remembers something different years later.

In 2000, Mike Williams, 31, vanishes while duck hunting on a Florida lake; his boat and his shotgun are found, but not his body; 17 years later, a violent kidnapping leads detectives to suspects who had been hiding in plain sight.

In 2011, Holly Bobo was abducted from her home in rural Tennessee. The investigation went cold for two years, until a hunter makes a gruesome discovery.

In 2014, Nancy Pfister's body was found in her closet. Police had several suspects but minimal evidence until they looked at her personal items.

Michelle Mockbee, 42, is beaten to death at work; robbery is ruled out since Mockbee is still wearing her pink sapphire ring; the case stalls until a video surfaces that blows it wide open.