The crash scene was found off Highway 59 and Snelling Road on Wednesday morning.
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The overturned car was found about 200 to 300 feet down an embankment on the side of the roadway.
The California Highway Patrol says a man's body was discovered in the wreckage.
Investigators don't know exactly when the crash happened but say the body was showing signs of decomposition.
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Officials said the crashed Toyota belongs to 63-year-old Steven Roach. Officers have not confirmed if he was the person found inside the car.