Dateline

Season 29 Episode 9: A Promise to Helene

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.

Genre:

Crime, Documentary

Seasons:

35

Episodes:

1200

Cast:

Lester Holt

Quality:

HD

Duration:

43 min

First Air:

1992

Rating:

6.6