The body of a 24-year-old criminology student is found wrapped in a blanket alongside a desolate road in Brooklyn, N.Y.; police discover that the bouncer at a bar is her killer.

When a 79-year-old woman is found shot to death in her home, investigators initially suspect her husband or a violent neighbor; shell casings recovered at the scene and a high-tech database reveal an unlikely killer.

A young single mother is abducted from a gas station and later found stabbed to death near an oil field; detectives use shoe and tire impressions to weed out numerous suspects and find the killer.

When a 23-year-old Marine dies in his bedroom, doctors initially believe a heart attack is to blame; when arsenic is found in his organs, his wife is charged with murder; a sharp attorney and toxicological testing uncover the truth.

When an 18-year-old girl is abducted while talking on a pay phone, forensic evidence found on her clothing points police in the direction of a suspect who shockingly confesses that he didn't act alone.

A Los Angeles based "kidnapping, ransom and murder" ring run by Russian immigrants is exposed when a pair of retired scientists use sonar equipment to locate their victims at the bottom of a reservoir.

Patients at the VA Hospital in Clarksburg, WV, keep dying after experiencing shockingly low blood sugar levels. An investigation into their deaths reveals that an overnight nurse is injecting patients with lethal doses of insulin.

A 70-year-old retired veteran is found dead on his boat after a bad sea storm. Investigators later discover he was killed during an attempted robbery after winning $400 in Keno.