Forensic scientists work with the only clue recovered from a multiple-victim shooting: a 12-gauge shotgun. Scientists use unique methods to lift the serial number from the weapon to trace it to its owner.
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A child's father was suspected when she was killed, but years later, police learned a convicted murderer lived nearby. Tiny drops of blood helped police solve the crime.
A look back at the case of the "River Park Rapist," who assaulted four women in South Bend, Indiana, in 1996. Law enforcement officers arrested Richard Alexander, who was convicted in 1998 and sentenced to 70 years in prison.
The body of a female prison guard is discovered at a landfill.
Technology able to analyze human bite-marks yields information on a woman's death.
Investigators look into the death of a teacher and discover that his death was not an accident.
In 1996, more than a dozen children in Seattle, Washington, were fighting for their lives.
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?
An American tourist is murdered in cold blood while at a Mexican resort.
A 1995 fire razes the mansion of a Kansas doctor, killing two of her three children.
Cat hairs found in evidence lead to the first testing of animal DNA to solve a crime.
Police reopen a case involving a woman who appeared to die from an accidental fall.
Young Navajos in the Southwest were dying at an alarming rate.
When an 11-year-old girl disappeared from a small town in a remote area of Alaska, investigators wondered if she'd been attacked by a bear or become lost in the dense woods. It turned out neither was true.
When 182 war veterans contract pneumonia-like symptoms in Philadelphia, doctors become stumped.
Children die at an alarming rate at a Texas hospital, and one nurse may be involved.
The news of a flight attendant's brutal murder prompted the son of a victim who had been killed five years earlier to contact police. Both murders had similar MOs, and analysis of biological evidence proved that these were serial killings.
Researchers investigate a woman's sudden death after taking aspirin.
The sudden appearance of thick fog causes a 99-car accident on I-75 in Tennessee, killing 12.
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.
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