(Fayette County, IN)--A man was seriously injured Monday in northern Fayette County in a freak accident that occurred while he was mowing his lawn.  The man was mowing in the Bentonville area when a large tree came down on him while he was on the riding mower.  He was trapped underneath.  A medical helicopter was called and carried the victim to a Level One trauma center.  His identity and condition have not been released.