Yakima County Coroner Jack Hawkins identified the victim as Cynthia Kelly-Munzanreder.
Officers said the shooting happened in the theatre's parking lot around 8:40 Thursday night. Police believe she was leaving a movie.
Union Gap Police rushed to the scene on S. 14th Street. They say a suspect ran off and the K-9 unit was called out.
Officers surrounded the nearby Toys R Us on E. Washington Ave., even putting police on the roof of the building. There is no word yet on if the theatre was put on lock down.
No suspect is currently in custody.
Details about the shooting victim remain limited. As of Friday morning, we have learned she lived in Yakima County.
Union Gap Police call this "an isolated incident" and say they are actively working the investigation. It is not believed to be gang-related.
No one else was hurt in the shooting.