D-P-S troopers continue to investigate a fatal accident involving a casino shuttle bus that killed one woman and injured more than 50 others. It happened Sunday night on Interstate 20 just west of Marshall. Troopers are centering their investigation around the bus driver, 69-year old Billy Nash of Saginaw. They say Nash may have become ill and slumped over the wheel just before the crash. 42-year old Errainer Archie of Dallas died when she was thrown either through the windshield or the door that was torn off. Dozens of the other passengers were taken to area hospitals. And now, most of those have been released. The shuttle bus was returning to the Dallas area after a trip to the Isle of Capri casino in Bossier City.