Christina Onassis ( ; 11 December 1950 -- 19 November 1988 ) was an American born Greek/Argentine businesswoman , socialite , and heiress to the Onassis fortune .
Christina Onassis ( December 11 , 1950 -- November 19 , 1988 ) was a Greek-Argentine businesswoman and socialite . She was the heiress to the Onassis family fortune .