Dateline NBC

By NBC News

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Current and classic episodes of Dateline NBC, featuring compelling true-crime mysteries, powerful documentaries and in-depth investigations.

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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.

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