Chicago Bears linebacker Dick Butkus hurdles to make a play against the Green Bay Packers on Dec. 14

Chicago Bears linebacker Dick Butkus hurdles to make a play against the Green Bay Packers on Dec. 14, 1969 at Wrigley Field in Chicago. The eight-time Pro Bowl Hall of Famer turned 74 years old on Dec. 9, 2016. (Neil Leifer)

GALLERY:Classic SI Photos of Dick Butkus