EE WAS PERFORMING HIS NORMAL JOB OF HAUL TRUCK OPERATION. AT APPROX. 3:00PM HE WAS SEEN PARKED IN FRONT OF MUCK PILE, SLUMPED OVER THE STEERING WHEEL. A FELLOW EE CHECKED ON HIM AND FOUND NO R ESPONSE AND NO PULSE. HE CONTACTED PLANT OFFICE & STARTED CPR. 911 WAS NOTIFIED & EMT'S ARRIVED.EE WAS TRANSPORTED TO HOSPITAL & WAS LATER PRONOUNCED DEAD. CAUSE OF DEATH-APPARENT HEART ATTAC