In 1963, Rzewski married Nicole Abbeloos; they had five children. While Rzewski never divorced Abbeloos, his companion for about the last 20 years of his life was Françoise Walot, with whom he had two children. He also had five grandchildren. Rzewski died of an apparent heart attack in Montiano, Tuscany, Italy, on June 26, 2021, at the age of 83.
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