He Killed Her in 1968. It Took 54 Years for Science to Prove It.

Diane Cusick, a 23-year-old dance instructor, left her home in Valley Stream, Long Island on February 15, 1968 — and never returned. For 54 years, the biological evidence collected from her clothing sat silent, waiting for science to catch up. This is the story of what may be the oldest DNA hit in American history to lead to a homicide prosecution, how a serial killer named Richard Cottingham hid in plain sight for decades, and why the Nassau County DA's office refused to let Diane's case go cold. If stories like this matter to you, subscribe to The Cold Seam. What does justice look like when it takes 54 years to arrive? Tell us what you think in the comments below. #DianeCusick #RichardCottingham #ColdCaseSolved #TrueCrimeDocumentary #ColdCase