Around 10:30 p.m. Friday night Sherman Police officers were dispatched to the 6900 block of South Highway 75. A vehicle traveling south on the highway struck the rear of an 18-wheeler.

Officers found the driver of the vehicle, who was from Lewisville, diseased when they arrived.

Lt. John Kennemer said the Critical Accident Investigation Team was notified and responded. It is still unclear what caused the collision. The investigation is ongoing.