Former Dallas Cowboys linebacker D.D. Lewis , a cornerstone of the 'Doomsday Defense' that won Super Bowl VI and Super Bowl XII, has died at the age of 79, the Cowboys announced on their official website Thursday (September 17).

Lewis, an All-American, SEC Defensive Player of the Year and two-time First-team All-SEC selection at Mississippi State who was eventually enshrined in the College Football Hall of Fame , was picked by Dallas at No. 159 overall in the sixth-round of the 1968 NFL Draft and spent his entire 13-year NFL career with the franchise. The Knoxville, Tennessee, native had a one-year military stint before returning to the Cowboys in 1070, initially backing up Chuck Howley before taking over as a full-time starter in 1973.

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