Cleveland Browns fullback Jim Brown (32) tries to stay warm as he looks on from the sideline in Cleveland Stadium circa 1963.

Minnesota Vikings defensive end Jim Marshall (70) looks on as snow falls in this undated photo.

Pittsburgh Steelers linebacker Jack Lambert (58) poses for a portrait with a flower in this undated photo.

Green Bay Packers head coach Vince Lombardi celebrates as he is carried off the field after winning the NFL Championship Game Jan. 1, 1967, in Dallas. The Green Bay Packers defeated the Dallas Cowboys 34-27.

Cleveland Browns back Jim Brown (32) is seen in this undated photo.

Cleveland Browns end Dick Deschaine (28) and halfback Ken Konz (22) warm themselves over a Coca Cola bucket filled with charcoal during an NFL game in Cleveland in 1958. (AP Photo/Tony Tomsic)

Chicago Bears running back Walter Payton (34) looks on from the sideline in this undated photo.

Baltimore Colts placekicker Jim O'Brien (80) celebrates after kicking a field goal with five seconds remaining in the game during Super Bowl V, Jan. 17, 1971, at the Orange Bowl in Miami. The Baltimore Colts defeated the Dallas Cowboys 16-13.

New England Patriots kicker Adam Vinatieri (4) celebrates after making a 45-yard field goal during Super Bowl XXXVI Feb. 3, 2002 at the Louisiana Superdome in New Orleans. The Patriots defeated the Rams 20-17.

Green Bay Packers wide receiver Sterling Sharpe (84) poses with his brother Denver Broncos tight end Shannon Sharpe before the start of an NFL game Dec. 30, 1990, in Denver.

Cleveland Browns running back Jim Brown (32) finds room to run against the Pittsburgh Steelers in this undated photo.

St. Louis Rams wide receiver Isaac Bruce (80) reacts after a play during an NFL game against the Tennessee Titans Oct. 31, 1999, in Nashville.

Green Bay Packers wide receiver Max McGee (85) catches the ball in the end zone for a touchdown during Super Bowl I on Jan. 15, 1967, at the Los Angeles Memorial Coliseum.

Cleveland Browns Hall of Fame running back Jim Brown (32) scores on a 1-yard dive during an NFL game against the Philadelphia Eagles in Cleveland on Nov. 7, 1965.

Green Bay Packers guard Fuzzy Thurston (63) is interviewed in the locker room at the conclusion of the NFL Championship Game against the Cleveland Browns in Green Bay, Wis., Jan. 2, 1966. The Packers defeated the Browns 23-12.

Chicago Bears receiver Dennis McKinnon (80) celebrates a touchdown during an NFL game against the Philadelphia Eagles Dec. 31, 1988 in Chicago.

Kansas City Chiefs defensive end Jerry Mays (75) shakes hands with defensive end Willie Davis (87) at the conclusion of Super Bowl I Jan. 15, 1967 at the Los Angeles Memorial Coliseum. The Green Bay Packers defeated the Kansas City Chiefs by the score of 35-10.

San Diego Chargers linebacker Junior Seau (55) looks on from the sideline during an NFL game against the New Orleans Saints Nov. 17, 1991, in San Diego.

Green Bay Packers guard Adam Timmerman (63) hugs a fan at the conclusion of the NFC Divisional Playoffs at Lambeau Field in Green Bay, Wis., Jan. 4, 1997.

Cleveland Browns wide receivers Webster Slaughter (84) and Reggie Langhorne (85) high-five after a successful play during an NFL game circa 1989.

St. Louis Cardinals safety Larry Wilson (8) blocks a kick by Cleveland Browns punter Gary Collins (86) during an NFL game Dec. 10, 1967 in St. Louis.

Green Bay Packers quarterback Brett Favre (4) and Jeff Thomason (83) celebrate after a touchdown against the New England Patriots during Super Bowl XXXI Sunday, Jan. 26, 1997 in New Orleans.

Buffalo Bills offensive guard Joe DeLamielleure (68) is covered in mud as he looks on from the sideline circa 1974.

San Francisco 49ers running back Roger Craig (33) celebrates after catching an 8-yard touchdown pass during Super Bowl XIX Jan. 20, 1985, at Stanford Stadium in Palo Alto, Calif.

Cincinnati Bengals head coach Paul Brown, left, speaks to Bengals quarterback Sam Wyche (14) in this undated photo.

Los Angeles Rams running back Eric Dickerson (29) is seen in action during an NFL game against the New York Jets Nov. 30, 1986 in East Rutherford, N.J.

Green Bay Packers head coach Vince Lombardi is seen during NFL Championship game against the Dallas Cowboys Jan. 1, 1967, in Dallas.

Dallas Cowboys wide receiver Michael Irvin (88) celebrates after making a touchdown during Super Bowl XXVII against the Buffalo Bills on Jan. 31, 1993, at the Rose Bowl in Pasadena, Calif.

Cleveland Browns fullback Jim Brown (32) tries to keep warm as he looks on from the sideline during an NFL game circa 1965.

Green Bay Packers running back Donny Anderson (44) is seen in action in this undated photo.

Oakland Raiders head coach John Madden is carried from the field by his players after his team defeated the Minnesota Vikings 32-14 at Super Bowl Xl on Jan. 9, 1977 in Pasadena, Calif.

Cleveland Browns receiver Gary Collins (86) fights for a touchdown pass against Pittsburgh Steelers safety Marv Woodson (47) during an NFL game in this undated photo.

Denver Broncos defensive end Lyle Alzado (77) looks on from the sideline circa 1978.

Cleveland Browns cornerback Bernie Parrish (30) attempts to block a kick against the New York Giants during an NFL game Sept. 16, 1962 in Cleveland.

New York Giants quarterback Y.A. Tittle (14) looks on from the sideline during an NFL game, circa 1960's.

Buffalo Bills defensive end Keith Willis (93) poses with MTV VJ Downtown Julie Brown during Super Bowl XXVII media day at Dodger stadium Jan. 26, 1993, in Los Angeles.

NFL photographer Tony Tomsic is seen on the sidelines prior an NFL football game between the Pittsburgh Steelers and Cleveland Browns on Sunday, Sept. 10, 2017 in Cleveland.