Louis John Heckman,Sr.-Indiana

Am trying to find info on my g.grandpa,Louis John Heckman, Sr., all I know that he is German. He had a son by the name of Louis John Heckman, Jr. and he married Clara Belle Croas. He is buried at Greenwood, Indiana. Nobody know anything about him, but I know he existed because I am here. Thank you, DeEtte Alexander