The Tractor Trailer Driver Killed In A Smyth County Crash Has Been Identified. 27 Year Old Gretchen Valladares Of Miami Florida Died After First Responders Worked For Two Hours To Free Her From The Tractor Trailer Following The Serious Crash Last Week. Officials Believe The Brakes Went Out On The Tractor Trailer That Was Hauling Pumpkins Causing Valladares To Lose Control And Overturn.