Oklahoma native Buddy Ryan passed away Tuesday after losing his battle with cancer, according to his agent as per NFL Media.
The NFL’s website says that Ryan was 82-years-old.
The former defensive mastermind won two Super Bowls, his most notable coming in 1985 as the defensive coordinator for the Chicago Bears. That Bears team is commonly regarded as the best defensive football team ever fielded.
Ryan is credited with inventing the "46 defense," an innovative defensive scheme that he perfected in the mid-1980s.
Ryan was the father of Buffalo Bills head coach Rex Ryan and Bills co-head coach Rob Ryan.