Who was married to the woman known as Jackie O until his assassination in 1963?
Jackie O (disambiguation) Jackie O often refers to Jacqueline Onassis. It may also refer to:
Madeleine Astor Madeleine Talmage Force Fiermonte (June 19, 1893 – March 27, 1940) was an American socialite and a survivor of the  . She was also the second wife and widow of businessman John Jacob Astor IV.