Philadelphia Eagles head coach Buddy Ryan directs play with defensive end Reggie White (92) in 1989 at an NFL football game. (Al Messerschmidt via AP)

Chicago Bears defensive coordinator Buddy Ryan is carried from the field by his players after his team defeated the the New England Patriots 46�10 during Super Bowl XX Jan. 26, 1986, at the Louisiana Superdome in New Orleans. (Tony Tomsic via AP)

Chicago Bears defensive coordinator Buddy Ryan is carried off the field by the team after the Bears beat the New England Patriots 46-10, on Jan. 26, 1986 in New Orleans, to win Super Bowl XX. (AP Photo)

New Orleans Saints defensive coordinator Rob Ryan, left, poses for photographs with his father Buddy Ryan, center, and bother, New York Jets head coach Rex Ryan, right, before an NFL football game Sunday, Nov. 3, 2013, in East Rutherford, N.J. (AP Photo/Bill Kostroun)

Former Philadelphia Eagles Head Coach Buddy Ryan is recognized at the half time presentation during the NFL game between the Chicago Bears and the Philadelphia Eagles. The Bears won 30-24 at Lincoln Financial Field in Philadelphia, Pennsylvania on Monday, November 7, 2011. (AP Photo/Brian Garfinkel)

President Barack Obama, right, smiles at defensive coordinator Buddy Ryan, center, as he stands with the 1985 Super Bowl XX Champions Chicago Bears football team during a ceremony on the South Lawn of the White House in Washington, Friday, Oct. 7, 2011. (AP Photo/Pablo Martinez Monsivais)

Defensive coach Buddy Ryan of the Chicago Bears hugs linebacker Otis Wilson (55) as they watch the final seconds run off the clock in the Bears game against the New York Giants, on Jan. 5, 1986 at Soldier Field in Chicago. The Bears defense held the Giants 181 yards in the game which sends the Bears against the Los Angeles Rams.(AP Photo/John Swart)

Buffalo Bills head coach Rex Ryan, left, visits with his father, Buddy Ryan, before an NFL football game against the Indianapolis Colts on Sunday, Sept. 13, 2015, in Orchard Park, N.Y. (AP Photo/Bill Wippert)

Football coaches, from left: Joe Gibbs, Washington Redskins; Buddy Ryan, Philadelphia Eagles and Bill Parcells, New York Giants, line up in New York to score funds for the Miami Project to cure paralysis, July 2, 1990. Slim-Fast Foods and six NFL coaches combined efforts to raise more than $80,000 for the project. (AP Photo/Marty Lederhandler)

Houston Oilers coach Buddy Ryan directs practice in August 1993. (Al Messerschmidt via AP)

Philadelphia Eagles head coach Buddy Ryan directs play December 18, 1989 against the New Orleans Saints in New Orleans. The Saints won 30 - 20. (AP Photo / Al Messerschmidt)

Arizona Cardinals head coach Buddy Ryan watches his team play the Detroit Lions, Aug. 19, 1994, in exhibition action in Pontiac, Mich. (AP Photo/Duane Burleson)

Randall Cunningham, quarterback for the Philadelphia Eagles talks with head coach Buddy Ryan during a light training session, Aug. 5, 1989, at London's Wembley Stadium where they will take on the Cleveland Browns for the 1989 American Bowl. (AP Photo/Gillian Allen)

Assistant Coach Buddy Ryan of the Chicago Bears on the sideline during Super Bowl XX, a 46-10 victory over the New England Patriots on January 26, 1986, at the Louisiana Superdome in New Orleans, Louisiana. (AP Photo/Al Messerschmidt)

Philadelphia Eagles head coach Buddy Ryan looks on from the sideline in a fog during the NFL NFC Wild Card playoff football game against the Los Angeles Rams on Dec. 31, 1989 in Philadelphia. The Rams won the game 21-7. (AP Photo/Paul Spinelli)

New Philadelphia Eagles head coach Buddy Ryan poses with his wife Joanie and sons Rex and Rob on their farm in Lawrenceburg on July 28, 1986. (AP Photo/Chuck Solomon)

Philadelphia Eagles coach Buddy Ryan, center, wearing cap, player Junior Tautalatasi and other members of the team watch from the sidelines as Eagles Paul McFadden's 43-yard field goal attempt in overtime missed, in Philadelphia, Dec. 8, 1986. The game against the St. Louis Cardinals ended in a 10-10 tie. (AP Photo/Rusty Kennedy)

Arizona Cardinals coach Buddy Ryan looks on as the Cleveland Browns stop the Cardinals on fourth and goal with one second left in the game to preserve a 32-0 shutout, Sept 18, 1994, in Cleveland. Others are unidentified. (AP Photo/Phil Long)

New York Jets' assistant coach Buddy Ryan is pictured at the Jets' camp at Hofstra College in Hempstead, N.Y., July 14, 1971. (AP Photo/Jim Wells)

Philadelphia Eagles head coach Buddy Ryan directs play in 1989 at an NFL football game. (Al Messerschmidt via AP)

Philadelphia Eagles head coach Buddy Ryan talks with the media after making Ohio State's Keith Byars their number one draft pick in Philadelphia, April 29, 1986. Eagles owner Norman Braman stands in the background. (AP Photo/Steven Falk)

Buddy Ryan looks on during warmups prior to an NFL football game between the New York Jets and Dallas Cowboys Sunday, Sept. 11, 2011, in East Rutherford, N.J. (AP Photo/Bill Kostroun)

Dallas Cowboys defensive coordinator Rob Ryan, left, hugs his father Buddy Ryan before an NFL football game against the Dallas Cowboys Sunday, Sept. 11, 2011, in East Rutherford, N.J. (AP Photo/Julio Cortez)

Cleveland Browns defensive coordinator Rob Ryan, right, walks with his father, Buddy Ryan, before an NFL football game against the New York Jets, Sunday, Nov. 14, 2010, in Cleveland. Buddy Ryan's other son, Rob's twin Rex, is head coach of the Jets. (AP Photo/David Richard)

Buddy Ryan, father of New York Jets coach Rex Ryan, at the football minicamp Tuesday, June 9, 2009 in Florham Park, N.J. (AP Photo/Bill Kostroun)

Houston Oilers coach Buddy Ryan leaves the field at halftime during play Dec. 25, 1993 against the San Francisco 49ers in San Francisco. (Al Messerschmidt via AP)

Philadelphia Eagles head coach Buddy Ryan with defensive lineman Jerome Brown during practice in 1989. (Al Messerschmidt via AP)