An 18-wheeler driver is dead this morning after an accident just north of Sinton. Troopers tell us the accident happened around 1:30 this morning on Highway 77. DPS tells 3 News the rig ran off an overpass, struck a water truck that was beneath the overpass and caught fire. Senior Corporal Charlie Ramirez says driver fatigue may have been a factor in the crash. The victim's identity has not yet been released.