A Promise to Helene
- Episode aired Oct 16, 2020
- TV-PG
![Dateline NBC (1992)](https://m.media-amazon.com/images/M/MV5BMWE1YWEzMTgtNDg3MS00YmMzLThkNDItOWE3YjkzZDA5MmJkXkEyXkFqcGdeQXVyODg3NDc1OTE@._V1_QL75_UX190_CR0,2,190,281_.jpg)
A 21-year-old college student is found murdered; the case remains cold for nearly 40 years, until a new detective uses an innovative method to catch her killer;A 21-year-old college student is found murdered; the case remains cold for nearly 40 years, until a new detective uses an innovative method to catch her killer;A 21-year-old college student is found murdered; the case remains cold for nearly 40 years, until a new detective uses an innovative method to catch her killer;