He has been identified as Ian Brady.
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It happened Saturday just after 6 pm on Highway 99, north of Clovis Avenue.
Officers say the 40-year-old driver was headed southbound on a road slick from rainfall when his Ram pickup veered down a grass embankment and collided with a wire fence.
The truck then rolled over, and Brady, who was not wearing a seatbelt, was thrown from the vehicle.
He died at the scene.
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The driver and two other 14-year-old passengers were taken to the hospital with injuries.
Officials believe speed and weather conditions contributed to the crash.
The investigation is ongoing.