A teenager went missing after an evening of horseback riding. Her body was found a month later, three miles from her home. The killer unknowingly left trace evidence behind, tiny but unmistakable clues which pointed to him and him alone.
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With no forensic evidence inside a murder scene, investigators were baffled. But they suspected that the victim's dog had witnessed the crime. If she had, forensic scientists would have had to find a way to find out what the dog had seen.
A young TV news producer is raped and murdered in her apartment. Police identify two suspects, but both are cleared of any wrongdoing. The case stalls for more than a year, and then investigators turn to the Commonwealth of Virginia's DNA data bank.
Two men were murdered while sleeping in their beds. The next night, arson destroyed a family planning clinic. Investigators wonder whether some shards of glass, paint chips, and a chicken feather could link what appeared to be two separate crimes.
When firefighters found an entire family dead inside their home, it looked like a murder-suicide, but there were several inconsistent clues in the rubble. Could ballistics, a time card, and some secret audiotapes unravel the mystery?
A police officer accused of killing his estranged wife insists she committed suicide. Investigators say it was murder and that it was physically impossible for the woman to have shot herself.
A union official was executed in his home not long after a strike by the union members. Neither his wife nor anyone in the neighborhood heard any gunshots. It would take a forensic sound test, an electron microscope, and a nightgown to explain why.
A man is found dead in his home, and his ex-wife has a perfect alibi. To determine the time of death, investigators need to know when the victim ate his last meal. An endocrinologist, a forensic botanist, and a short-order cook answer their question.
Police were puzzled by an obscure print found at a crime scene where one man had been killed, and two teenage girls were seriously injured. Neither of the girls could identify their attacker.
Time of death becomes pivotal after a pregnant woman is found murdered in her air-conditioned bedroom. A striking similarity between her death and an HBO movie gives examiners the clues they need to thaw out the alibi of a cold-blooded killer.
A 34-year-old nurse experiences a variety of flu-like symptoms. None of her doctors can discover the cause until she visits the gynecologist for a routine checkup. Then she learns it's something far worse than the flu.
A woman's death in Pennsylvania triggers a homicide investigation into another woman's death in North Carolina. The similarities in the cases were striking, and examiners must determine if the suspect's story about accidental drowning is all wet.
At a murder scene, investigators find a shoe print, several foreign hairs, and unknown fingerprints. But they believe the most telling piece of evidence is the bite mark on the victim's chest.
A woman is shot to death in her store just one day before she is to testify against the man accused of robbing her. The robber becomes the prime suspect, but he has a solid alibi: a time-stamped videotape of his activities on the day of the murder.
A mother of two vanishes after a shopping trip. Her body is discovered a month later. Witnesses say they saw the victim being forced into a car by an unknown person.
In 1962, the people of the small town of Hanford, California, lost their sense of peace when one of their own, 15-year-old Marlene Miller, was murdered.
In 1999, a 12-year-old was found murdered in her home, and it changed the feeling of security residents had in the small town of Waseca, Minnesota. Despite a meticulous search of the home and an exhaustive investigation, police had no suspects.
A man died in his home after a long history of heart disease. It was assumed that this was the cause of his death. A few weeks after the funeral, rumors surfaced that the death was no accident.
A pregnant woman is found murdered in her air-conditioned bedroom.
A nurse learns that she has been deliberately infected with HIV.
Authorities track a kidnapper who allowed his victim, 17-year-old Shari Smith, to write a last will on a notepad and then informed the family of her murder, as well as the later murder of a 10-year-old, Debra May Helmick.
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