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.
In 2000, Judy Southern arrived home from work and was shot by a gunman waiting within. Her husband Allen arrived shortly afterwards, called 911 to report his wife had been shot.
In 1996, Derrick Duehren returned to find his Oregon home burned to the ground. His wife's charred remains were later found in the rubble.
Responding to a 2008 garage fire, Illinois emergency response discovered a man crushed beneath a truck.
In 1997, Kelly Eckart's car was found, with her belongings still in it, after she worked a late shift in Franklin, Indiana. Days later, her body was found in an isolated ravine.
A man's wife took her own life and his college sweetheart killed herself the same way. Was it coincidence?
When a hit-and-run boating accident caused a death, police must search for one boat among 1200 others.
A millionaire and his family were executed in their own home. For three years, the murders went unsolved. Finally, a box of ammunition and some fluorescent fibers revealed the ultimate betrayal.
The brutal murder of a state park employee over $2,000 rattles her co-workers and tourists while leaving police to sift through hundreds of leads.
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.
On Halloween night 2004, Adriane Insogna and Leslie Mazzara were brutally murdered in their Napa home.
A Russian immigrant is found dead and a strange phone call to his office is the only lead investigators have.
In 1969, phone operator Diane Maxwell is murdered. Her brother promised he'd find out who was responsible.
The killer probably hoped to cover his tracks by staging the crime scene. But investigators saw through the attempt almost immediately.
A brutal murder, lots of suspects and conflicting evidence but the forensics were clear on one thing: The killer knew his victim. And that alone gave investigators a head start.
When a man's story of a killing contradicted physical evidence, investigators turned to forensic science.
When a hit-and-run accident claimed the life of a high school athlete, everyone in town mourned his passing. Finding the killer was a long shot at best.
The victim was well liked and successful, which made the brutality of the crime even harder to understand.
A lifelong resident of the tiny town of Lefroy, Tasmania was murdered outside his own home. Robbery appeared to be the motive, but with no suspects, the investigation came to a halt.
When a college student is reported missing, police believe their investigation will be like countless others.