EE told his wife on phone at 11:30 pm that he was tired & would call her back later. At about 12:00 am, the loader he was operating had a flat tire & he went to get another loader. At about 4:40 am, the ee was found inside the cab of the loader that had not been moved since it was parked earlier on the 26th. Death believed to be ""Natural Causes"". Autopsy was inconclusive.