CHICAGO - SEPTEMBER 18: Linebacker Mike Singletary #50 of the Chicago Bears looks on during a game against the Minnesota Vikings at Soldier Field Stadium on September 18, 1988 in Chicago, Illinois. The Vikings won 31-7. (Photo by Jonathan Daniel/Getty Images)

Hall of Fame linebacker Mike Singletary (50) of the Chicago Bears chases Lions running back Billy Sims (20) during the Bears 23-7 loss to the Detroit Lions on November 22, 1981 at Soldier Field in Chicago, Illinois. (Photo by Don Lansu/NFL Photos)

Chicago Bears Hall of Fame linebacker Mike Singletary (50) and linebacker Otis Wilson (55) line up during a 12-10 victory over the Green Bay Packers on November 23, 1986, at Soldier Field in Chicago, Illinois. (Photo by NFL Photos)

10 Sep 1989: Linebacker Mike Singletary of the Chicago Bears looks on during a game against the Cincinnati Bengals at Soldier Field in Chicago, Illinois. The Bears won the game, 17-14. (Photo by Jonathan Daniel/Allsport)

Linebacker Mike Singletary, of the Chicago Bears strips the ball Ffrom wide receiver Stanley Morgan of the New England Patriots DURING in Super Bowl XX at the Superdome in New Orleans, Louisiana. (Photo by NFL Photos)

Chicago Bears Hall of Fame linebacker Mike Singletary (50) hammers Green Bay Packers running back Brent Fullwood (21) during a 24-6 Bears victory on September 25, 1988, at Lambeau Field in Green Bay, Wisconsin. (Photo by Bill Smith/NFL Photos)

Chicago Bears Hall of Fame linebacker Mike Singletary (50) thanks the crowd before his final home game, a 30-6 victory over the Pittsburgh Steelers on December 13, 1992, at Soldier Field in Chicago, Illinois. (Photo by Bruce Dierdorff/NFL Photos)

Mike Singletary, left, stands with his presenter, Kim, his wife, after being inducted into the Pro-Football Hall of Fame Saturday, August 1, 1998 in Canton, Ohio. Singletary had 1,488 tackles, 13 fumble recoveries and seven interceptions in his career. (AP Photo/Tony Dejak)

Former Chicago Bears Mike Singletary speaks to the media Monday, Nov. 1, 1999 in Lake Forest Ill. following the announcement earlier in the day of Walter Payton's death. Singletary played with Payton from 1981-1987. (AP Photo/Ted S. Warren)

New San Francisco 49ers head coach Mike Singletary gestures during a news conference at the 49ers' football headquarters in Santa Clara, Calif., Tuesday, Oct. 21, 2008. Singletary takes over after Mike Nolan was fired. (AP Photo/Paul Sakuma)