I checked the Death Records at the Gibson County Health Dept. but did not find a listing for either Leroy Richardson or Isabella Richardson. At the Library, I checked the Montgomery Cemetery listings in Columbia Township and found several Richardsons but nothing for Leroy or Isabella. There was an Ida Richardson (b. 1870; d. 1940) but she was married to Perry Richardson. There was also an Alma M. Richardson listed (3/6/1910 - 8/30/1913) but she was the daughter of Emery J. & Clara E. (Battram) Richardson. I did find in the Gibson County Birth Index book (1882 - 1920) a male child born on 2/4/1897 to Leroy Richardson and Isabel Burns.
Sorry I couldn't be more helpful to you!