Troopers said a minivan rolled on Ahtanum Road, 10 miles west of Yakima, and landed on its top.
The passenger, 28-year-old Jaime Santillan, died at the scene, according to WSP. The driver, 27-year-old Timoteo Ontiberos, was taken to a Yakima hospital before he was airlifted to Harborview Medical Center in Seattle.
WSP said neither person was wearing a seatbelt.
Troopers said the investigation revealed drugs or alcohol were involved. The cause of the crash is still under investigation and charges are pending.