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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Seattle police had no suspects in the violent murder of post-grunge singer, Mia Zapata. More than a decade passed before the evidence could be used by forensic scientists to identify the killer.
The woman in the back of the truck was flailing her arms, screaming. They thought she was doing something dangerous for the fun of it.
A skeleton was discovered in the North Carolina marshlands. Investigators learned she'd been dead for months.
In 2002, funeral director Lonnie Turner, Sr. was found shot to death. His son Lonnie Jr. became the prime suspect, particularly after it was discovered that the murder was committed with his gun. However, he had an alibi for the time of the murder.
A driver said he couldn't have hit and killed a pedestrian because his Jeep had been sold months ago.
A Michigan State University grad student disappeared and was presumed dead. With the help of a professor of geological sciences, police hoped to get the "dirt" on her killer.
Police get a clue about a couple who disappeared on Memorial Day weekend during an in-progress robbery.
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.
In 1993, young mother Tammy Tatum was sexually assaulted and murdered in her Longmont, Colorado apartment.
Police don't have a basis for comparison to match shoe impressions, blood drops and DNA evidence from a murder scene.
In 2001, Ginger Hayes and her infant son Nicholas were abducted during a carjacking and the crime had been reported by a witness within minutes of occurrence.
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 2003, Tiffany Rowell and three of her friends were brutally murdered in affluent Clear Lake, Texas.
A murder trail turned cold, until police got a call from a woman whose husband, Gerald Powers, had a criminal past and a fondness for Chevy Berettas.
In 2006, Nevada politician Kathy Augustine died mysteriously during a hard-fought re-election campaign and the medical examiner could neither isolate the cause of death.
On Halloween night 2004, Adriane Insogna and Leslie Mazzara were brutally murdered in their Napa home.
Christina Sanoubane was murdered in her Cedar Rapids apartment after moving away from her abusive boyfriend.
In 2008, college co-ed Jenna Verhaalen was found dead in her Bryan, Texas apartment. Petechial hemorrhages in her eyes indicated that she was strangled.
The victim had ingested a massive amount of cyanide. An unlikely clue - a flaw on a mailing envelope - exposed a murderer who was willing to kill innocent people.
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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