Helmets signed by Hall of Famers are seen at the McKinley Grand Hotel in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Helmets signed by Hall of Famers are seen at the McKinley Grand Hotel in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Helmets signed by Hall of Famer Bob Lilly are seen at the McKinley Grand Hotel in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Footballs signed by Hall of Famers are seen at the McKinley Grand Hotel in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

A helmet signed by Hall of Fame inductee Jack Butler is seen at the McKinley Grand Hotel in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Books autographed by Hall of Famers are seen at the McKinley Grand Hotel in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

A detailed view of Chuck Bednarik's Hall of Fame jacket at the McKinley Grand Hotel in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

A detailed view of Chuck Bednarik's Hall of Fame jacket at the McKinley Grand Hotel in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

A detailed view of Chuck Bednarik's Hall of Fame jacket at the McKinley Grand Hotel in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Former NFL coach Bill Parcells arrives at the McKinley Grand Hotel in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Hall of Fame running back Earl Campbell signs autographs at the McKinley Grand Hotel in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Hall of Fame running back Earl Campbell signs autographs at the McKinley Grand Hotel in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Hall of Fame cornerback Willie Brown signs autographs at the McKinley Grand Hotel in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Hall of Fame defensive end Fred Dean signs autographs at the McKinley Grand Hotel in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

A fan waits for autographs at the McKinley Grand Hotel in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Hall of Fame wide receiver Michael Irvin signs autographs at the McKinley Grand Hotel in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Hall of Famer John Randal signs autographs at the McKinley Grand Hotel in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Cleveland Browns fans pose for a photo in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Vacant spaces are shown before busts are installed of the 2012 Hall of Fame class at the NFL Hall of Fame in Canton, Ohio on August 4, 2012. (Ben Liebenberg/NFL)

The jersey of New England Patriots tight end Rob Gronkowski is shown on display at the NFL Hall of Fame in Canton, Ohio on August 4, 2012. (Ben Liebenberg/NFL)

The shoe of former NFL player Tom Dempsey is shown at the Hall of Fame in Canton, Ohio on August 4, 2012. (Ben Liebenberg/NFL)

A piece of artificial field known as "Tartan Turf" from Three Rivers Stadium is shown on display at the NFL Hall of Fame in Canton, Ohio on August 4, 2012. (Ben Liebenberg/NFL).

(L-R) Jack Butler, Dermontti Dawson, Chris Doleman, Cortez Kennedy, Curtis Martin, and Willie Roaf look on before receiving their gold jackets at the Canton Civic Center in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

NFL Commissioner Roger Goodell addresses the crowd at the Canton Civic Center in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Former NFL running back and Hall of Fame member Marshall Faulk greets Willie Roaf at the Canton Civic Center in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Curtis Martin acknowledges the crowd before being presented with his gold jacket at the Canton Memorial Civic Center in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Cortez Kennedy is introduced before being presented with his gold jacket at the Canton Memorial Civic Center in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Dermontti Dawson is fitted with his gold jacket at the Canton Civic Center in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Cortez Kennedy waves to the crowd after receiving his gold jacket at the Canton Civic Center in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Curtis Martin receives his gold jacket at the Canton Civic Center in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Curtis Martin walks on stage with former NFL coach Bill Parcells at the Canton Civic Center in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Willie Roaf waves to the crowd after receiving his gold jacket at the Canton Civic Center in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Jack Butler waves to the crowd after receiving his gold jacket at the Canton Civic Center in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

Jack Butler smiles after receiving his gold jacket at the Canton Civic Center in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)

(L-R) Willie Roaf, Jack Butler, Cortez Kennedy, Chris Doleman, Curtis Martin, and Dermontti Dawson pose for a photograph after receiving their gold jackets at the Canton Civic Center in Canton, Ohio on August 3, 2012. (Ben Liebenberg/NFL)