Raiders owner Al Davis watches Los Angeles Raiders practice before exhibition game against the Houston Oilers at the Oakland Coliseum Saturday, August 26, 1989. It has been about eight years since the Raiders played at the Oakland Coliseum as the Oakland Raisers. (AP Photo/Scott Anger)

Oakland Raiders principal owner Al Davis holds up the Vince Lombardi Trophy in a jubilant Raiders locker room after they defeated the Philadelphia Eagles 27-10 in Super Bowl XV, Jan. 25, 1981. The Raiders, who had lost to the Eagles in the regular season, became the first wild-card team to win a Super Bowl. (AP Photo/Paul Sakuma)

Oakland Raiders Hall of Fame owner Al Davis, President of the General Partner, in an undated photo. (National Football League)

Oakland Raiders Hall of Fame owner AL Davis, President of the General Partner, in an undated photo. (National Football League)

Oakland Raiders owner Al Davis congratulates his players in the locker room after Super Bowl XV, a 27-10 victory over the Philadelphia Eagles on January 25, 1981, at the Louisiana Superdome in New Orleans, Louisiana. (AP Photo / Al Messerschmidt)

Oakland Raiders Hall of Fame owner Al Davis, President of the General Partner, poses with the Lombardi trophy. (Pro Football Hall of Fame)

Al Davis, managing general partner of the Raiders, is introduced as a member of the Pro Football Hall of Fame Class of 1992 on the field before the NFC's 21-15 victory over the AFC in the 1992 NFL Pro Bowl played on Feb. 2, 1992 at Aloha Stadium in Honolulu, Hawaii. (National Football League)

John Riggins, Al Davis, John Mackey, and Lem Barney are introduced as the Pro Football Hall of Fame Class of 1992 on the field before the NFC's 21-15 victory over the AFC in the 1992 NFL Pro Bowl played on Feb. 2, 1992 at Aloha Stadium in Honolulu, Hawaii. (National Football League)

San Francisco 49ers vs. Los Angles Raiders at Candlestick Park Sunday, September 12. 1982. Raiders beat 49ers 23-17. Raider Owner Al Davis on Sidelines. (AP Photo/Al Golub)

Old foes talk on the field as Kansas City Chiefs Hall of Fame head coach Hank Stram, working as the CBS Radio analyst, and Los Angeles Raiders Managing General Partner Al Davis get together before the Raiders 20-10 victory over the Cincinnati Bengals in the 1990 AFC Divisional Playoff Game on January 13, 1991 at the Los Angeles Memorial Coliseum in Los Angeles, California. (National Football League)

Oakland Raiders Hall of Fame owner Al Davis, President of the General Partner, in an undated photo. (AP Photo)

Los Angeles Raiders' owner Al Davis is the center of attention Wednesday afternoon April 14, 1983 after a Federal Court jury ruled in favor of the team and the Los Angeles Coliseum in an antitrust suit against the National Football League. Jury awards were $11.5 million for the Raiders and about $5 million to the Coliseum, which brought the original suit in 1978. (AP Photo/Nick Ut)

The crypt of Al Davis is seen adorned with an Oakland Raider helmet and three Super Bowl trophies Monday, Oct. 17, 2011, at the Chapel of the Chimes in Oakland, Calif. The final resting place of the Raiders former majority owner will be beside American blues singer-songwriter and guitarist, John Lee Hooker, and cost $100,000. (AP Photo/Ben Margot)

Oakland Raiders owner Al Davis smiles during an NFL football news conference at Raiders headquarters in Alameda, Calif., Wednesday, Feb. 4, 2009. The Raiders retained head coach Tom Cable, officially removing the interim designation from his title more than five weeks after their season ended. (AP Photo/Paul Sakuma)

Oakland Raiders head coach Al Davis smiles during an NFL football news conference at Raiders headquarters in Alameda, Calif., Wednesday, Feb. 4, 2009. The Raiders retained head coach Tom Cable, officially removing the interim designation from his title more than five weeks after their season ended. (AP Photo/Paul Sakuma)

Oakland Raiders owner Al Davis reads a letter he wrote to former Raiders head coach Lane Kiffin during a news conference at Raiders headquarters in Alameda, Calif., Tuesday, Sept. 30, 2008. The Raiders Kiffin on Tuesday just four games into his second season with the football team. (AP Photo/Paul Sakuma)

Oakland Raiders owner Al Davis, right, and new interim head coach Tom Cable listen during a news conference at Raiders headquarters in Alameda, Calif., Tuesday, Sept. 30, 2008. The Raiders fired head football coach Lane Kiffin on Tuesday, Sept. 30, 2008, just four games into his second season, bringing finality to a situation that had been simmering for eight months. (AP Photo/Paul Sakuma)

Oakland/Los Angeles Raiders owner Al Davis on the sidelines at Raiders games. (AP Photo/Kevin Reece)

Former Oakland Raiders coach John Madden, right, puts his arm around Raiders owner Al Davis after Davis introduced Madden for enshrinement into the Pro Football Hall of Fame, Saturday, Aug. 5, 2006, in Canton, Ohio. (AP Photo/Mark Duncan)

Oakland Raiders' owner Al Davis listens to questions during a news conference at football training camp in Napa, Calif., Tuesday, Aug. 1, 2006. (AP Photo/Jeff Chiu)

Oakland Raiders owner Al Davis gives a thumbs-up to fans prior to the game with the Kansas City Chiefs on Saturday, Dec. 26, 1998, in Oakland, Calif. (AP Photo/Paul Sakuma)

Oakland Raiders owner Al Davis smiles during a press conference at the team's Alameda, Calif., practice facility Tuesday, Jan. 27, 1998. The conference was held to introduce the team's new head coach, Jon Gruden. (AP Photo/Dan Krauss)

NFL Commissioner Paul Tagliabue poses with Al Davis, a member of the Pro Football Hall of Fame Class of 1992 on the field before the NFC's 21-15 victory over the AFC in the 1992 NFL Pro Bowl played on February 2, 1992 at Aloha Stadium in Honolulu, Hawaii. (National Football League)

Los Angeles Raiders Hall of Fame owner Al Davis watches from the sideline during the 1983 AFC Championship NFL game against the Seattle Seahawks in Los Angeles, Jan. 8, 1984. The Raiders defeated the Seahawks 30-14. (National Football League)