LEFT REAR TIRE TREADS AT HIGHWAY SPEED, VEHICLE ROLLS OVER, LEAVES HIGHWAY, KILLING BELTED DRIVER. THE TIRE WAS THE FORMER SPARE TIRE AND LIGHTLY USED. IT WAS 6 YEARS OLD AND MAY HAVE DEGRADED OVER TIME PURSUANT TO INFORMATION IN COMMENT TO DOCKET 03-15400 FILED WITH NHTSA ON 11-5-04 BY SEAN KANE OF SAFETY RESEARCH.*AK