During an otherwise quiet April night, Pennsylvania State Trooper Kevin Foley swerved from the path of duty and repeatedly stabbed Dr. John Yelenic to death. The vicious murder of the popular dentist rocked the community of Blairsville, Pennsylvania.

Documentarian Andrea Niapas gives us a thorough look at the crime and its aftermath, describing Dr. Yelenic's troubled marriage and complicated home life, and untangling the events that led his wife's lover--Trooper Foley--to commit such a violently aggressive crime.

Found guilty by a jury of his peers, Trooper Foley has never confessed to the crime. What were the forces motivating Foley to break his oath to protect and serve? Do we even now know the truth about that awful night?

Commonwealth v. Foley was a landmark case in the history of DNA evidence, as described in a bonus chapter by DNA expert Dr. Mark Perlin on "The Blairsville Slaying and the Dawn of DNA Computing". It was the first time that a sophisticated computer had ever interpreted a DNA mixture in a criminal trial. The Pennsylvania appellate court later established a statewide precedent for Cybergenetics TrueAllele® Casework technology. Dr. Perlin tells about the 7% unknown DNA fraction under the victim's fingernails, and how TrueAllele identified Mr. Foley a million times more powerfully than human review. Dr. John Yelenic was brutally and tragically murdered, but the trial that convicted his killer bequeathed to society a powerful truth-seeking technology for bringing criminals to justice.