Hi Lois, I didn't find a definitive answer about when Jonathan died.
The Porter-Bay Family Tree shows he died 1910 in Oregon, trees.ancestry.com/tree/10576604/person/56098903, however, a source isn't listed.
Jonathan and Mary might have divorced too.
You can contact the oregon State Archives for Clackamas County divorces 1869-1899 and death records 1907-1915. Go to Oregon State Archives arcweb.sos.state.or.us/vital.html . Successful Searching & Happy Holidays!