GREGG COUNTY — One person has been killed in a one-vehicle crash on Interstate Highway 20 in Gregg County. Around 9:30 Friday morning, dispatchers were alerted to a wreck at mile marker 591 near Farm Road 2087. When troopers arrived, they found a truck that had run off the road and hit a tree. The driver of the pickup, Justin Schattel, 25, was pronounced dead. His hometown is unknown at this time. Authorities believe the crash was caused by Schattel driving at an unsafe speed.