Patricia Stahl Cold Case_ DNA Could Finally Identify Her Killer.

The 1971 killing of 20-year-old Patricia Ann Stahl remains unsolved more than five decades after a teenage suspect was arrested, tried, and acquitted. Retired NYPD Sergeant Bill Cannon examines the semen evidence, disputed ballistics, timeline problems, and another known offender whose violent crimes showed disturbing similarities to Patricia's case. Could modern DNA testing and investigative genetic genealogy finally identify Patricia Stahl's killer?