Of the Johns who died at Kapunda this is the only one close to his age. South Australian Deaths Registrations 1842 to 1915 John WILLIAMS Date: 1899-06-28 Age: 56y Status: N Relative: (not recorded) Residence: Kapunda Death Place: Kapunda District Code: Kap Symbol: H Book: 262 / Page: 156
Regrettably, a death certificates in those years do not have any useful details.
Have you seen a death certificate for Mary Ann nee DUNKLEY to know whether or not she was a widow or if John was still alive?
Not certain this was Mary Ann nee DUNKLEY supposedly aged 28 when she married John in Dec 1891. 16465/1926WILLIAMSMARY AJOHNMARYBROKEN HILL WILLIAMS MARY ANN MethodistMETH M5 36 6115-Aug-1926 62YEARS 30839