ADA, Mich. (AP) — A private ceremony has been held for Michigan philanthropist Helen J. DeVos. Direct-sales company Amway said in a statement that DeVos was buried Saturday in Ada, near Grand Rapids. DeVos died Wednesday at age 90 of complications from a stroke following a recent diagnosis of myeloid leukemia. She was the wife of Rich DeVos, who co-founded Amway and owns the Orlando Magic.