William possibly died in 1821[1]. There was another William Ingram who married in Chichester in 1788 so there is no certainty.
Sources
↑ "England Deaths and Burials, 1538-1991," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:J83N-7TR : 24 December 2014), William Ingram, 24 Feb 1821; citing , reference 537; FHL microfilm 1,068,511.
"England Births and Christenings, 1538-1975," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:NGPW-3J1 : 30 December 2014), William Moon Ingram, 28 Sep 1741; citing SAINT PANCRAS,CHICHESTER,SUSSEX,ENGLAND, reference ; FHL microfilm 504,431.
"England Marriages, 1538–1973 ," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:NK3X-KMZ : 10 December 2014), William Moon Ingram and Mary Thomas, 05 Sep 1773; citing Saint Peter The Great Or Subdeanery Of Chichester, Chichester, Sussex, England, reference ; FHL microfilm 1,468,999.