After computer whiz Cari Farver goes missing, she starts sending threatening text messages to her new boyfriend, his ex-lover and her mother; it's up to the police to determine if she's a deranged stalker or a murder victim.

A 19-year-old convenience store clerk vanishes in Sheridan, Wyo.; a gruesome discovery seems to point police to a cold-blooded killer.

Anna-Sigga Nicolazzi meets with the detective and prosecutor who took on the case of Karen Ann Watson, a wife and mother who was brutally stabbed to death in 1987; nearly 30 years later, they track down a killer who thinks he got away with murder.

Young mother Nancy Klinger goes missing after telling friends she's working undercover on a black-market baby sting.

Las Vegas police hunt for the monster who raped and murdered a high school sophomore before he strikes again.

A 59-year-old grandmother is discovered beaten and stabbed to death in her home on Mother's Day.

Penske Racing chef Cindy Albrecht goes missing from her home near the Indianapolis Motor Speedway in Speedway, Ind., then her headless body is later found by deer hunters.

In Pensacola, Fla., a beloved barber is gunned down in his shop in broad daylight; DNA left at the crime scene may hold the answer to solving this murder mystery.

After grandmother Irene Kennedy is found dead in a park, a distant relative is charged with her murder, splitting her family apart; it will take years, another killing and a jail house snitch to bring the family back together.

Young mother Tyshika Askins is found strangled to death in her home; after charging the wrong man, police realize the key to solving the case lies in an orange juice container left out on a kitchen counter.