Motives & Murders: Cracking the Case

When a pregnant 23-year-old Iowa woman is shot in her own bed, investigators must quickly determine if they are looking for someone with a deadly grudge against the couple or a more sinister culprit closer to home.

In Cleveland, a 14-year-old African American girl on her way to school is snatched off the street, assaulted and murdered. Initially, detectives work the case 24/7, but it will take a lucky break and nearly 30 years before the culprit is behind bars.

On her last day as a high school freshman, a 14-year-old girl is brutally beaten and set on fire. The horrifying crime sends shock waves through her California community, and with a possible serial killer on the loose, investigators hunt for a monster.

Popular school teacher Marilyn Habian is shot in the heart in the basement of her Cleveland-area home, and years after the case goes cold, news of a potential prison confession leads investigators back to her front door.

A devout Mormon and popular university student, Brooke Wilberger is abducted from an Oregon parking lot in broad daylight. Police immediately launch a massive search, and the story of the missing 19-year-old soon captures headlines nationwide.

A woman's body is dumped in an Orlando, Florida, park, and as detectives connect the dots, a spate of seemingly random beatings, carjackings and murders soon tells the story of a one-man crime spree.

While building their seaside dream home in Connecticut, Matthew Monahon discovers his pregnant wife Kelsey hogtied on the floor and clinging to life. When she dies days later, a $300,000 life insurance policy casts him as the number one suspect.

Kimberly Dunkin's body is found with a single gunshot to the head, and though investigators suspect she was the victim of a gang war, it will take 15 years, a deck of playing cards and a lucky break before the case finally begins to unravel.

On a September morning in 1973, Debra Dill's bludgeoned body is discovered next to her car in rural Maine. Her grieving community wakes up to a nightmare, but it will take nearly two decades before the killer is behind bars.

When the naked, blood-soaked body of a young woman is found on the floor of her Orlando, Florida, apartment, it's up to investigators to find her killer before he strikes again.