Armed with little else, police hoped the shoe impressions found at a Lansing, Michigan, crime scene would put their investigation of Audrey Nichols' murder back on track.
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The apparently motiveless murders of two children baffle police.
A drop of blood and burned bones provide evidence of murder two years after the investigation began.
A mother with Munchausen syndrome by proxy kills one child and physically abuses another.
A speck of bicycle paint and a speck of nickel tie a suspect to the murder of a 9-year-old.
The use of DNA testing helps exonerate a person accused of raping a young Virginia woman.
A strand of hair and traces of blood lead investigators to a woman's killer.
Detectives learn a genetic disorder caused children's deaths, overturning their mother's conviction.
Forensic scientists re-examine a death previously ruled accidental.
Detectives find a girl's disappearance has suspicious similarities to her sister's disappearance.
Investigators search for the person responsible for killing justice officials with mail bombs.
Microscopic evidence helps solve murders near Sacramento, Calif.
Autopsies connect several deaths to poison-induced liver disintegration.
Heavy rains and snow runoff carry manure into Milwaukee's water supply, making 400,000 people ill.
Microorganisms found in the mouth of a murder victim lead to the killer.
A man kills two people with bombs in an effort to get investors off his back.
A teacher who complained of being stalked and harassed by another teacher was scamming police.
Researchers investigate a woman's sudden death after taking aspirin.
A custodian finds a burned body in a dumpster and investigators try to determine its identity.
Police uncover a trail that reveals a husband's plot to kill his wife for insurance money.
When a woman exhibits flu-like symptoms before dying, investigators determine she was poisoned.
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