OP has a family tree online, but without much additional info. OP lives in the same county in KY where this man was born.
See my comments above. I believe this same man was known as Thomas S.Sharp, not James Thomas Stewart for most of his life.
I suspect that he is the one who had several children with Dorothy Marie Reece (as above), but cannot be sure until we hear back from OP.
The subject was born 2 December 1925, so he would not be married by 1940 census.
He died is buried in Tucson, AZ.
I don't know of anything else to do until we get more info from OP.