Lives changed in the 20 years following an unsolved murder, and so did forensic science. In time, a high-powered microscope and DNA profiling revealed a clue no one had seen before.
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A woman appears to have lost control of her SUV and plunged down an embankment into a shallow creek. But investigators suspect foul play when they find snowy footprints leading from the crime scene.
In 2007, the Florida mobile home of Effie and Michael Ratley catches fire. Michael heroically rescues his wife and infant son. A month later, his wife is found beaten to death in a bedroom of his parents' home.
The killer probably hoped to cover his tracks by staging the crime scene. But investigators saw through the attempt almost immediately.
A young woman is stabbed more than 100 times. The killer leaves DNA behind, but investigators must play a cat-and-mouse game to obtain a suspect's DNA to match.
When Kristine Fitzhugh failed to show up for her music class, her husband found her dead at the bottom of the stairs of their Palo Alto home. Further investigation reveals evidence of murder in the kitchen.
In 1999, Patrick McRae was found dead in his Des Moines home and the crime scene was awash with blood.
In 2004, Mary Ann Clibbery was found brutally murdered in her Illinois business and investigators had to determine if this was a robbery gone wrong or a calculated murder.
Lives changed in the 20 years following an unsolved murder, and so did forensic science. In time, a high-powered microscope and DNA profiling revealed a clue no one had seen before.
The wife of a respected police officer was murdered in her own home. The crime went unsolved for more than a decade, until a newly formed cold case unit took a fresh look at the evidence.
Even though their daughter had run away before, she'd always come back. Her parents were sure this time would be no different, but they were wrong.
In 2008, the body of Colorado real estate developer Alan Helmick was found by his wife, Miriam, who then became the prime suspect.
Two suspects are linked to a murder by bloodstained boots and a gun, but the owner of the items says he has never met the victim.
Police don't have a basis for comparison to match shoe impressions, blood drops and DNA evidence from a murder scene.
Volunteers and police spend weeks searching for a missing girl. A psychic later leads them to a field where the body was found.
A woman was found dead on the bedroom floor of her apartment. The crime scene yielded little of value and investigators wondered if they would find enough evidence to make a case.
An assistant manager of a Florida steakhouse is stabbed to death. It appears to be a robbery gone wrong.
Police arrested a suspect for the death of a girl. But new technology proved the wrong man was behind bars.
When court clerk Peter Porco doesn't report to his work in November 2004, a courts officer is ordered to the Porcos' family home in Bethlehem, NY.
When DNA proves that a man who practically admits to a brutal attack is innocent, police wonder why he is willing to take the blame.
A young woman attends evening church services... then disappears. When her abandoned car is found, the tank is empty and a gas can she kept in her trunk for emergencies is missing.
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