The big rig was so badly burned, the Fresno County Sheriff's Office said it will require DNA tests to find out who the driver was.
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The semi was traveling north on 99 near Highland Avenue shortly before 6:30 Tuesday morning. For unknown reasons the driver veered off the highway. The rig fell several feet to the roadway below before catching fire.
No other vehicles were involved.
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Big Rig driver killed after driving off Highway 99 in Selma