A young woman suddenly becomes critically ill, eventually leaving her unable to walk. A bone marrow test reveals the cause: arsenic poisoning. Investigators must determine if the poisoning was caused by groundwater contamination or something more sinister.
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In 1988, the body of a young woman was discovered in an Ohio river. Most of the evidence had been washed away, but the victim's 6-year-old son unwittingly told investigators all they needed to know - without saying a word. The clue was in his genes.
On September 17, 1984, in a suburb of Tucson, Arizona, eight-year-old Vicki Hoskins left home on her pink bicycle to mail a letter for her mother. She never returned, but her slightly damaged bicycle was found nearby.
After a street fight takes the life of a national wrestling champion, police must determine if he was killed in cold blood or in self-defense.
Bruce Miller was shot to death in the office of a junkyard business. When a computer forensics expert examined the computers owned by the victim's wife, he found all the evidence needed.
In 1988, when a patient dies unexpectedly in the office of California neurologist Richard Boggs, police begin what they think will be a routine investigation. Soon they uncover a bizarre story of corpse stealing, fake identity and sexual perversion.
The wife of a murdered horse rancher explains that the last time she saw her husband was when he was leaving the house to go jogging. Police become suspicious when forensic evidence eventually leads investigators back to the ranch.
On the night of May 22, 1992, Betty Wilson returned home and walked up the stairs to the bedroom. She discovered her husband lying in a pool of blood. Jack Wilson had obviously been murdered...but how? And by whom? Even the experts couldn't agree.
While at a real estate conference in St. Louis, a man finds his wife drowned in the bathtub in their hotel room.
British detectives worked with a pioneering scientist to solve crimes of sexual assault and serial murder. This 1986 case marked the first time DNA was used as evidence in a court of law.
A mother claims that an intruder murdered her two sons, but lacking a motive, police use blood-spatter analysis and behavioral profiling to reconstruct a different scenario.
The 1996 investigation into 48-year-old Martha Hansen's murder is helped by a legal requirement that bars have video cameras installed on the premises.
An investigation of a pediatrician, prompted by the death of one of her patients, leads to a Texas hospital where the pediatric mortality rate is higher than at any hospital in the country.
In 1993, Marie Robards suffered the loss of her father due to a heart attack - but it was more sinister.
The flu-like symptoms of a mother and her children proved to be something more serious: thallium poisoning.
In rural Canada, Dr. John Schneeberger is accused of sedating and sexually assaulting one of his female patients and his stepdaughter. DNA tests demonstrate that the doctor is innocent, but the patient insists that he sedated and raped her.
Shortly after daybreak in Vancouver, British Columbia, a fire was set in a dumpster. No one saw either the arsonist or the fire, and it burned for hours in the deserted parking lot.
When Chris Ochoa confessed to the 1988 rape and murder of Nancy DePriest, the case was closed. 8 years later, Achim Marino confessed to the same crime. Can DNA evidence identify the real perpetrator?
After the murder of Seattle residents, evidence from the couple's dog eventually ties a murderer to the scene.
In 1984, California firefighters battled ten arson fires in three weeks. When cigarettes and a scrap of paper connected the case to similar fires further north, the hunt was on for a dangerous pyromaniac.
The investigation into the kidnapping and rape of an 18-year-old Ohio woman is aided when the victim returns hours after the incident occurred. With her help, the police are able to track the assailant to his front door.
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