Unusual Suspects

January 4, 2015

Shortly before Thanksgiving, a Philadelphia suburb is rocked by the murder of 67-year-old Alice Hufnagle.

January 11, 2015

In Portsmouth, Va., a 16-year-old ballet dancer is assaulted and murdered in her home, and detectives must investigate her family members as well as her circle of friends.

January 18, 2015

When a college student is found murdered in his Arlington, Texas, apartment, investigators suspect the kindhearted victim's generosity may have led a killer to his door.

January 25, 2015

A video tape surfaces after a naval officer is raped and stabbed suggesting the victim may have been silenced to prevent a scandal.

February 8, 2015

In Fort Pierce, Fla., a tax attorney is found strangled to death, and detectives must scrutinize deadbeat tenants and delinquent clients while hunting for his killer.

February 15, 2015

When a beloved matriarch is found murdered, her friends and neighbors come under suspicion as detectives investigate the first homicide in the small town of Hubbardston, Mich.

February 22, 2015

A young Navy wife is found raped and strangled to death in her home near the Mayport Naval Station in Jacksonville, Fla.

March 1, 2015

An elementary school teacher goes missing after her first day at a new job, and investigators sift through clues to uncover the heartbreaking truth behind her sudden disappearance.

March 8, 2015

There is no sign of a break-in when 13-year-old Mollie Pittman is attacked and murdered in the Orlando, Fla., home of family friends; it takes investigators 17 years to find out whether she knew her killer.

March 15, 2015

In La Jolla, Calif., telemarketing manager David Stevens' charred body is found in his burned-out car, and detectives encounter a rogue's gallery of suspects while looking for his killer.

March 22, 2015

In Stockton, Calif., investigators search for 23-year-old Dalene Carlson who has gone missing, then a tractor operator makes a gruesome discovery in a cornfield.

March 29, 2015

In 1988, a 9-year-old girl goes missing in Great Falls, Mont.; the case goes cold until a chance encounter at a bus stop breathes new life into the investigation and leads to the horrifying truth behind the girl's disappearance.

April 5, 2015

Philadelphia investigators bring to light the obsession that drove a suspect to murder student Deborah Wilson, who was found strangled to death in a university computer laboratory without her shoes and socks.