The accident was reported around 8:30 p.m. on Marine Drive at Hermosa Beach Drive.
Detectives with the Snohomish County Sheriff's Office are investigating the cause of the crash.
The woman, 47, died at the scene, sheriff's office spokeswoman Shari Ireton said.
The man, 49, was transported to Providence Regional Medical Center Everett. He is believed to be the driver, Ireton said.
No other vehicles were involved. Speed and alcohol were both believed to be factors, but the crash remains under investigation, Ireton said.
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