A truck driver is dead after a freak accident in the Lehigh Tunnel.  Howard Sexton, 70, of New Jersey, was traveling southbound through the tunnel last night just after 6pm when a metal conduit broke through his windshield, striking him in the head.  Sexton was able to get his vehicle out of the tunnel and onto the shoulder of the road.  Shortly after, state police found him dead behind the wheel.  An investigation is ongoing.