EMPLOYEE WAS IN THE PROCESS OF REPAIRING #3 SHUTTLE CAR CABLE. POWER TO CABLE HAD BEEN TAGGED & LOCKED OUT. HE WAS DISCOVERED LYING ON HIS BACK & NOT BREATHING. CPR WAS ADMINISTERED AND HE WAS TRANSPORTED TO THE HOSPITAL WHERE HE WAS PRONOUNCED DEAD AT APPROX. 8:20 P.M. MSHA/STATE INVESTIGATIONS ARE INCONCLUSIVE AT THIS TIME.