Who's Your Daddy Forensic Files : Season 7 Episode 4

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 clue was in his genes.