Life Katherine Helmond, star of ‘Who’s the Boss?’ and ‘Soap,’ dies at 89 March 1, 2019Sara M Moniuszko, USA TODAYComments Off on Katherine Helmond, star of ‘Who’s the Boss?’ and ‘Soap,’ dies at 89 Actress Katherine Helmond, best known for her work in "Who's the Boss?" and "Soap," has died. She was 89.