Disappeared - Season 4 (2011)

Disappeared looks at the case of Amber Gerweck who vanished after leaving her home in Michigan. He car is later discovered over 600 miles away in Georgia. As her parents search for her, she eventually turn up in Illinois suffering from a serious case of amnesia.

Disappeared looks at the case of fifteen year-old Colleen Orsborn of Daytona Beach who vanished shortly after skipping school in order to go the the beach. The investigation to find her takes a dark turn when a witness links a serial killer to her disappearance.

Disappeared investigates the case of Tallahassee resident Jerry Michael Williams who vanished while going duck hunting on Lake Seminole. Search efforts discover no body. When his wife cashes in a large insurance policy and marries the man who sold her husband the insurance policy, police suspect foul play.

Disappeared examines the case of Brianna Maitland who was last seen leaving her dish-washing job at a hotel in Montgomery, Vermont. He car was later found mysterious parked partially inside an abandoned barn. Investigators speculate that her disappearance may be linked to two local drug dealers.

Disappeared looks at the case of Lily Aramburo in Miami who vanished after leaving her fiancé's condo wearing only a nightgown and carrying two bungee cords. Given Lily's history early investigators focus on drugs, but after several years pass a re-evaluation has focuses attention on Lily's fiancé.

Disappeared examines the case of wife and mother Tina McQuaig of Jacksonville, Florida, who disappeared after leaving her job at a pharmacy. Her car is discovered parked at a Wall-Mart. Police discover evidence of infidelity and after they discover a body focus their investigation on the man who the believe was her lover.

Jamie Fraley vanished from her North Carolina apartment with no signs of foul play. Detectives learn that her boyfriend's father developed an obsession with Jamie while his son was in prison, but a grim discovery changes the course of the investigation.

College freshman Ginni Wood drops out of contact with her mother while on a spring break road trip to visit her best friend Kelly Gaskins in Texas. The mystery deepens when investigators realize that Kelly and her boyfriend may be missing too.

Jackie Markham, a feisty trucking company manager, vanishes from her Florida home without a trace of violence. A boyfriend's tale suggesting she departed with a rival suitor appears to crumble - just as her purse is found near the lair of a serial killer.