FamilySearch.org has a possibility for what you are seeking in Texas. "Texas Deaths, 1890-1976," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K39W-J18 : 13 March 2018), Anthony Blackmon in entry for Frances Goodwyn, 14 Aug 1941; citing certificate number 38615, State Registrar Office, Austin; FHL microfilm 2,138,745. and "Texas Death Index, 1903-2000," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VZN3-43F : 24 May 2014), Marcus A Blackmon, 01 Oct 1933; from "Texas, Death Index, 1903-2000," database, Ancestry (http://www.ancestry.com : 2006); citing certificate number 45813, Hall, Texas, Texas Department of Health, State Vital Statistics Unit, Austin. Finally, "United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3P6-CL4 : accessed 26 October 2020), Francis R Blackmon in household of Anthony Blackmon, Justice Precincts 2, 5, 4, Live Oak, Texas, United States; citing enumeration district (ED) 67, sheet 9A, family 142, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,655.