Dateline Season 29 Episode 9 A Promise to Helene ( Air Date 2020-10-16 ) Genre Crime, Documentary category. Overview "When college student Helene Pruszynski is found murdered, her case remains cold for nearly 40 years until a new detective uses an innovative method to catch the killer. Josh Mankiewicz reports.".
Dateline Season 29 Episode 9 A Promise to Helene
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