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Sep. 09, 1977 - MARIA CALLAS IS DEAD ââ¬â¤½ MARIA CALLAS, the famous Italian Opera singer, died of a heart attach in the American Hospital in Paris, she was 53. She was married to Italian Industrialist Giovanni Meneghini. They have been separated for the last 18 years. Her most famous boyfriend was Aristotle Onassis, the Greek shipping tycoon. Photo Shows: Maria Callas seen with Tito Gobbi, left, and Renato Cioni, after a performance in ââ¬ÅToscaââ¬Â at the Royal Opera House, Covent Garden, 1965. (Credit Image: © Keystone Press Agency/ZUMA Wire)