Indianapolis Motor Speedway announced his departure in a news release Monday.
Unser is just one of 10 drivers to acquire the most prestigious Indy 500 at least three occasions and was the first driver to win the race in 3 unique decades, a feat later matched by Rick Mears.
Bobby was a part of this mythical Unser household of racecar drivers. His older brother, Jerry Unser, died at Indianapolis Motor Speedway in an accident during training before their 1959 Indy 500. His younger brother, Al Unser, is a four-time winner of the Indy 500, along with also his nephew Al Unser, Jr, won the race . In general, six members of the Unser family have raced at the Indianapolis 500.
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Unser was inducted into many motorsports Halls of Fame including the Indianapolis Motor Speedway Hall of Fame, the International Motorsports Hall of Fame, as well as the Motorsports Hall of Fame of America.