One Man Is Dead And Another Is In Critical Condition At A Kingsport Hospital After A Tractor-Trailer They Were In, Plunged Off Interstate 81 Between Two Bridges In Blountville. According To The Tennessee Highway Patrol, The Fed Ex Truck Entered The Median, Jumped A Bern At The Exit 69 Overpass And Landed On Highway 394 Below. The Cab Of The Truck Was Totally Demolished. The Truck Had Departed From Nashville And Was Headed To Pennsylvania. No Names Have Been Released At This Time. The Crash Remains Under Investigation.