Forensic Files S02 E10 Sealed with a Kiss

"No Witnesses. No Leads. No Problem."

For more than a year, angry, hateful letters were sent to a first grade school teacher in a small town in Pennsylvania. When scientists analyzed the letters, they found evidence that the stalker knew a lot about the victim - more, in fact, than anyone could possibly have imagined. DNA analysis would eventually help seal the perpetrator's fate.