It happened before 9 am on Highway 33 north of Sutter Avenue, between Coalinga and Avenal.
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California Highway Patrol officers said a man was reported walking in the roadway near that area.
Moments later, someone reported that a man was found in the roadway with severe injuries.
A medical helicopter flew him to Community Regional Medical Center for treatment.
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Officers said parts of the vehicle were found at the scene. Investigators believe it is a gray vehicle that has a missing right side mirror.