Dateline: Secrets Uncovered (2017)

S01E16 Deadly Triangle

Title: Deadly Triangle Plot: When a murderer remains at large for a quarter of a century, it seems they have successfully evaded justice; the investigation stalls and hope fades. However, the past has a way of resurfacing, and just when it appears that the case is frozen in time, new evidence emerges, reigniting the hunt for the elusive killer.