A college student was found dead, and the evidence suggested he knew his killer. Three hairs and some microscopic cells helped police unravel a web of lies and find the motive for murder.
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Photographs found in a dumpster lead to the killer of a model.
Police are dispatched to the scene of a shooting and discover the victim's husband is one of their own: a homicide detective who says his wife accidentally shot herself in the head.
A human skull retrieved from a watery grave reveals a ghastly crime.
Detectives find a mismatched button and follow the thread back to a woman's killer.
A young bride-to-be is gunned down and investigators uncover the man she loved was living a lie.
A killer assaults a young mother in her home, but despite meticulous washing, a single hair remains.
In 2002, the eyes of the world were on Virginia and Maryland. A serial sniper was on the loose, killing innocent, unsuspecting citizens. Just how was he caught?
Microscopic evidence helps solve murders near Sacramento, Calif.
Cat hairs found in evidence lead to the first testing of animal DNA to solve a crime.
A week after a couple disappears from the beach, police get a mysterious lead from a robbery.
A device intended to save lives proves to be the only witness to a man's death.
The tests of a plant pathologist and a dendrochronologist lead to a surprising revelation.
A nurse learns that she has been deliberately infected with HIV.
A postcard incriminates a high religious figure with crimes committed during World War II.
When the police sprayed Scott Dunn's bedroom with luminol, a scene of horrific violence emerged.
In 1962, the people of the small town of Hanford, California, lost their sense of peace when one of their own, 15-year-old Marlene Miller, was murdered.
A 34-year-old nurse experiences a variety of flu-like symptoms. None of her doctors can discover the cause until she visits the gynecologist for a routine checkup. Then she learns it's something far worse than the flu.
A retired police officer is discovered in his bed, dead of a single gunshot wound to the head. His wife first says the motive was robbery; then she tells police he committed suicide.
A woman, who had recently rejected a co-worker half her age, ends up dead in her driveway.
Detectives use a forged signature to find a woman's abductor.
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