Law & Order: Special Victims Unit 5x21

Criminal

When it becomes obvious that a forensics expert raped and murdered a student, the investigation focuses on a criminology professor Cragen arrested decades earlier for similar crimes, and it’s up to Cragen and his team to discover if the professor is the perpetrator or the victim of a bitter rival, a disappearing alibi witness, a corrupt businessman, and ultimately, Cragen’s rush to judgment.