Wilson, 37, was from Sheffield, England, and had competed in American open-wheel racing since 2004. He recorded seven career IndyCar victories — the most recent in 2012 at Texas Motor Speedway — and eight pole starts in 174 races.
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The racing community reacted immediately to the news, with Dale Earnhardt Jr., Danica Patrick, Jeff Gordon and Jimmie Johnson taking part in the outpouring of support: