Alberto Ascari
Alberto Ascari was an Italian racing driver and twice Formula One World Champion. He was a multitalented racer who completed in motorcycle racing before switching to cars. Back to back World titles in 1952 and 1953 sandwiched an appearance in the Indianapolis 500 in 1952. Ascari also won the legendary Mille Miglia in 1954. He once admitted that he warned his children not to become extremely close to him because of the risk involved in his profession. So this proved when he was killed during a test session for Scuderia Ferrari at the Autodromo Nazionale Monza. He was preparing for the Supercortemaggiore 1000 kilometre race that he was to have run with his protg Eugenio Castellotti on the weekend that followed the accident.
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Source: Wikipedia