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The victim was driving east on Highway 12 south of Dunbar Road around 6:10 a.m. when he drifted to the right shoulder then veered across the highway into oncoming traffic, CHP Officer Jonathan Sloat said.
The Honda spun and was struck on the driver's side by a 2009 Subaru driven by Thomas Taylor, 31, of Sonoma, Sloat said.
The collision tore the Honda into two pieces and killed the driver, whose body was still being removed from his car around 9 a.m., Sloat said.
The Subaru overturned and came to rest upright, Sloat said. Taylor was taken to Santa Rosa Memorial Hospital with injuries that were not life-threatening, Sloat said.
Sloat said a separate, minor collision occurred behind the first accident.
The road was wet and it was raining at the time of the crash but the cause remains under investigation, Sloat said.
Highway 12 was completely reopened around 9:20 a.m.
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