taken from autosport.com:
Motor racing legend and the only American-born Formula One world champion Phil Hill has died tonight in a California hospital due to complications from Parkinson's disease. He was 81 years old.
Phil Hill won the world championship driving for Ferrari in 1961, becoming the first American to do so, later to be followed only by Mario Andretti. But Hill remains to date the only native-born American to win the title.
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RIP