A 15-year-old was killed and three others were seriously injured in a single-vehicle rollover crash early Thursday morning in Eastland County.

According to the Texas Department of Public Safety, the crash occurred at approximately 2:20 a.m. Thursday on State Highway 6 near mile marker 348. A preliminary investigation indicates a 2014 Chevrolet Tahoe was traveling eastbound when the 19-year-old driver, who was operating at an unsafe speed, failed to negotiate a curve.

The vehicle entered the center median before crossing back over the highway, leaving the roadway and overturning.