The crash was reported at 5:17 a.m. in the 117000 block of Tidwell Road at Valley Forest Drive on a bridge.
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The man driving a white Chevy Malibu was either impaired or fatigued going eastbound on Tidwell when he veered into a Chevy Camaro's lane, according to Lt. Simon Chang.
The 32-year-old man was found dead at the scene while the woman, according to Chang, sustained serious injuries.
"She tried to avoid the wreck, but there was a concrete barrier, so she couldn't avoid it," Chang said.
Deputies didn't see any open containers, but they did find the man's cell phone in the seat.
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"We don't want to allege he was on his phone but looking into what caused it," Chang said.
Tidwell Road is shut down between Ticonderoga and John Ralston.