In 1988, the body of a young woman was discovered in an Ohio river under ice. Most of the evidence found at the crime scene -- hairs, fibers, & fingerprints-- had been washed away. But the victim's 6 year-old son unwittingly told investigators all they needed to know about the killer... and he did it without saying a word. The clues was in his genes.
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Ready to Watch Forensic Files, Season 1, Episode 105?