It happened a little after 1 Tuesday morning on US 283, 2 miles north of Vernon.
DPS Trooper Tony Fulton says 34-year-old Rhodnee Fernandez may have fallen asleep while driving his semi-truck hauling crude oil.
Police say Fernandez ran off the road, causing the semi to roll over on it right side. Then Fulton says, it caught fire.
Fernandez was pronounced dead on the scene.
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