Edmonds police are seeking a black car suspected of hitting a pedestrian on Highway 99 at 236th Street Southwest at 8:35 p.m. Sunday.
The victim, a 49-year-old female, was taken to Harborview Medical Center with a serious head injury.
The suspect vehicle was last seen headed southbound on Highway 99.
According to Edmonds police spokesman Sgt. Shane Hawley, drivers should avoid the area while police continue to investigate the incident.