DNA Solves 1970 Bite Mark Murder

A young legal secretary was found murdered in her own apartment in 1970, and the killer left

behind one of the most puzzling clues in forensic history. Nancy Bennallack was stabbed multiple

times in what appeared to be a crime of passion, but what investigators discovered next

would haunt them for decades. At the crime scene, they found a bite mark on her body.

This was before DNA technology existed, so forensic dentists could only analyze the pattern of teeth.

What made this bite mark extraordinary was its unusual characteristics. The killer had distinct

dental features that should have made identification easier, yet no suspect ever

matched. For over 50 years, this case went cold. The bite mark evidence was preserved,