Sommarly Suon, 26, was a passenger on a motorcycle that struck a barrier on westbound I-90 around 7 p.m. Wednesday.
Both riders were thrown.
Suon died later at a Seattle hospital, according to the King County Medical Examiner's Office.
Her death was ruled an accident.
The motorcycle's driver, a Bothell man, 20, was seriously injured but is expected to recover, according to the Washington State Patrol.
No further information was available.
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