In 1980, Michigan resident Shannon Mohr died in what was reported to be a horseback riding accident by her new husband David Davis. After her death, Shannon's family reported to police their suspicions that Davis seemed far from grief-stricken.
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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.
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.
When the number of bloodstains at a scene were abnormal, it was up to forensic scientists to find out why.
A girl claimed she had been abducted. She recounted what happened but things didn't add up to police.
A bomb, constructed to cause as much damage as possible, kills a victim with deadly force and flame. When a search yields some tiny clues, police are able to identify the killer.
A wealthy man and his wife were attacked by three masked men outside their luxurious Louisiana home. He was shot dead and she was forced to open their hidden safe.
An 82-year-old woman was found dead. Clues on the victim's body would tell police what happened that night.
When a woman went missing, friends and family were determined to find her. Their worst fears were confirmed weeks later when her body was discovered.
A man was killed in a car crash, but the evidence led investigators to believe it was not an accident.
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.
When a hit-and-run boating accident caused a death, police must search for one boat among 1200 others.
The medical examiner ruled a death an accident, but the detectives thought the evidence indicated otherwise.
A driver said he couldn't have hit and killed a pedestrian because his Jeep had been sold months ago.
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.
Three homicides on two continents looked like professional executions. Investigators on both sides of the Atlantic needed to find out if they were related and, if they were, who or what they had in common.
When Genell Plude is found dead in her bathroom, the scene points to suicide. But a coroner's inquest and a unique application of forensic science gave investigators a different explanation for her death.
A serial arsonist was on the loose in Washington, DC. Each of the fires was started with the same type of incendiary device. The perpetrator was very careful, and seemed to leave no evidence behind... but there were clues in the ashes, and it was up to forensic scientists to find them.
When the head chef of a historic Philadelphia restaurant was found dead, investigators interviewed the usual suspects: family, friends and coworkers. As they sifted through the evidence, police uncovered a chilling tale of debt and deceit.
Police hoped the shoe impressions found at a crime scene would put their investigation back on track.
When a victim is brutally murdered in his bed, investigators find a shoe impression in the mud outside.
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