There is an Isidro who died in San Antonio, Bexar county Texas in 1932, 1938, 1940, and I think 1942. I know that one of the 40-41 was buried in the Military cemetery and that is not the one. In 1940-1941 Mary Marin was in Michigan which is when he died she moved there. I think it would be either in the 1930's that he died. My father thought he was still alive when they moved to Michigan. And they were in Michigan from about 1935 to the present.