A Promise to Helene Dateline: Unforgettable : Season 2 Episode 18
Oxygen 2h 00m
Aired: November 8th, 2022 @ 8:00 PM EST on Oxygen
A college student is found murdered and the case sits cold for nearly 40 years. Josh Mankiewicz reflects on the vow that keeps the case alive and the innovative method used to catch the killer.
