EE WAS WORKING ON MILL OPRATION CONTROL ROOM ALL SHIFT. AT 3:55 PM, PT MGR COULD NOT LOCATE HIM. HE WENT INTO CONTROL ROOM AND FOUND HIM COLLAPSED ON FLOOR UNCONCIOUS. CPR WAS GIVEN AND CMT WAS CALLED HE WAS NOT ABLE TO BE BROUGHT AROUND. IT IS BELIEVED HE HAD A MASSIVE HEART ATTACK.