EMPLOYEE WAS WORKING ON THE 4TH FLOOR OF SCREEN TOWER. A GUARD RAIL WAS REMOVED TO LOWER A PIECEOF SCRAP TO THE GROUND. AFTER SCRAP WAS LOWERED,EMPLOYEE WAS BELIEVED TO BE THROWING ANOTHER PIE CE TO THE GROUND WHEN HE FELL FROM THE OPENING TO THE GROUND 56 FEET BELOW. FALL PROTECTION WAS PROVIDED BUT NOT USED.