There was no clear reason for a young, healthy college student to be dead. But when the coroner discovered a tiny clue during the autopsy, investigators were able to uncover a mystery.
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Doctors don't know why a scientist is gravely ill. When tests reveal the cause, it's too late to save him.
How did the stalker obtain the security system code for his victim's home? How did he steal her personal photographs? Police needed answers and they found them in the most unlikely of places.
The body of a college co-ed was found on a farm covered with her own denim as well as the jeans of the killer.
Avis Banks and her unborn child were brutally murdered. The body was discovered by her fiancé, Keyon Pittman. When police learned that Pittman was having affairs with other women, he became the prime suspect.
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 1986, Gary Dale Larson was stabbed to death in his Edmond, Oklahoma home and then the killer sexually assaulted Larson's girlfriend Janet Haynes.
A young woman is found dead in her apartment. With little evidence at the scene, the case turns cold.
The body of a young girl was discovered on isolated farmland near Delano, California. She had no ID, but police found mailbox keys in the pocket of her jeans.
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.
In 2006, Darlene VanderGiesen received threatening emails and then disappeared. Tracking the source of the emails led police to the home of Daphne Wright, where they believe a murder was committed.
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.
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.
They thought the fire would cover their crime. But one tiny clue led to a trio of killers behind bars.
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 1987, the death of Crystal Purcell was considered an accident. Then in 2001, Barbara Purcell called police to suggest that her estranged husband had killed Crystal.
The prime suspect had a criminal record and his driver's license was found at the scene of a brutal double homicide.
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.
Police are able to create a composite sketch of a man burnt beyond recognition. But tracking the killer is more challenging.
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 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.
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