Motives & Murders: Cracking the Case

When a work crew uncovers a woman’s skull on a stretch of Florida highway, investigators try to determine who she is and find her killer. But it will take a bizarre discovery over a thousand miles away before the grizzly truth is finally revealed.

Single mother Donna Kitowski heads to a Las Vegas supermarket late at night but never returns.

When Cathy Lamb is brutally murdered in her Palm Beach, Florida home, the only witnesses are her three blood-soaked dogs. The gruesome scene baffles detectives. And with no suspects and no murder weapon, they have only their suspicions to go on.

During a slumber party, a man appears at 12-year-old Polly Klaas's bedroom door and abducts her at knife point.

The rape and murder of a 19-year-old journalism student in her bed is the latest in a string of unsolved homicides in a college town.

Investigators believe a serial robber, rapist, and murderer is terrorizing cities up and down the west coast. And as the death toll rises, police jurisdictions in three states join the hunt for the ‘I-5 Killer.’

A single mother is murdered in Michigan and the police search for a man known only as "B."

Five people who were abducted at a fast-food restaurant are murdered execution-style in Kilgore, Texas.

This episode has no summary.

A young woman is randomly gunned down in a Maryland suburb and it takes 25 years to find the killer.

The killer of a 17-year-old Florida girl is finally found.

A mother dies from cyanide poisoning and the investigation unravels a shocking story.

A popular college student is brutally stabbed to death during her first-ever night shift at a convenience store in Great Falls, Montana. And it will take a decade before an informant comes forward with a story that leads the cops to her killer.