It happened Monday around 2 am on northbound Highway 99, north of Atwater Boulevard.
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The California Highway Patrol says a 24-year-old driver thought he'd hit an object in the road. The driver called 911 after realizing he had hit a man on the highway.
Investigators say the 52-year-old victim had already been hit by another driver. He was pronounced dead at the scene.
Officers discovered a broken license plate registered to a 2018 Toyota Camry in Livingston. Hours later, CHP officers arrested the owner, 21-year-old Raul Jaime.
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Officials say they're still working to determine what led to the crash and search for more evidence. They do not believe alcohol was a factor.
Jaime was arrested on hit-and-run charges.