1. Dateline NBC
  2. A Promise to Helene
2020-10-21 40:39

A Promise to Helene

When 21-year-old college student Helene Pruszynski is found murdered, the case remains cold for nearly forty years until a new detective uses an innovative method to catch Helene’s killer. Josh Mankiewicz reports. Originally aired on NBC on October 16, 2020.

40:39

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