Brian Urlacher through the years

Brian Urlacher, who spent 13 seasons with the Chicago Bears, announced his retirement on Wednesday.

Brian Urlacher

Brian Urlacher

Free safety Brian Urlacher #44 of the University of New Mexico Lobos in action during the game against the Idaho State Bengals in 1998. (Getty Images)

Brian Urlacher

Brian Urlacher in action with the Chicago Bears during his rookie season in 2000. (Getty Images)

Brian Urlacher

Brian Urlacher in action against the Green Bay Packers in 2002. (Getty Images)

Brian Urlacher

Brian Urlacher is introduced before the game against the Detroit Lions on September 12, 2004 at Soldier Field. (Getty Images)

Brian Urlacher

Brian Urlacher of the Chicago Bears slams a basketball while playing a charity event in 2005. (Getty Images)

Brian Urlacher

Brian Urlacher looks on against the New York Jets on November 19, 2006 at Giants Stadium in East Rutherford, New Jersey. (Getty Images)

Brian Urlacher

Brian Urlacher displays the George Halas trophy after play against the New Orleans Saints in the NFC Championship game at Soldier Field in 2007. (Getty Images)

Brian Urlacher

Brian Urlacher watches Colts Peyton Manning during Super Bowl XLI between the Indianapolis Colts and Chicago Bears at Dolphins Stadium in Miami, Florida on February 4, 2007. (Getty Images)

Brian Urlacher

Adrian Peterson  breaks away from Brian Urlacher #54 of the Chicago Bears in 2007. (Getty Images)

Brian Urlacher

Brian Urlacher hits Mark Sanchez in a 2010 game. (Getty Images)

Cutler, Forte lead way, Bears beat Colts, 41-21

Chicago Bears linebacker Brian Urlacher (54) celebrates after a quarterback sack against the Indianapolis Colts during the first half of an NFL football game in Chicago, Sunday, Sept. 9, 2012. (AP Photo/Nam Y. Huh)

Detroit Lions v Chicago Bears

CHICAGO, IL - OCTOBER 22: Brian Urlacher #54 of the Chicago Bears knocks away a pass to Brandon Pettigrew #87 of the Detroit Lions at Soldier Field on October 22, 2012 in Chicago, Illinois. The Bears defeated the Lions 13-7. (Photo by Jonathan Daniel/Getty Images)

Chicago Bears v Tennessee Titans

NASHVILLE, TN - NOVEMBER 04: Brian Urlacher #54 of the Chicago Bears runs back an interception for a touchdown against the Tennessee Titans at LP Field on November 4, 2012 in Nashville, Tennessee. (Photo by Frederick Breedon/Getty Images)

Bears force 5 turnovers, rout Titans 51-20

Chicago Bears middle linebacker Brian Urlacher (54) celebrates with Julius Peppers (90) and Tim Jennings (26) after Urlacher returned an interception for a touchdown against the Tennessee Titans in the first quarter of an NFL football game on Sunday, Nov. 4, 2012, in Nashville, Tenn. (AP Photo/Joe Howell)

Houston Texans v Chicago Bears

CHICAGO, IL - NOVEMBER 11: Brian Urlacher #54 of the Chicago Bears hits Garrett Graham #88 of the Houston Texans at Soldier Field on November 11, 2012 in Chicago, Illinois. The Texans defeated the Bears 13-6. (Photo by Jonathan Daniel/Getty Images)

Seattle Seahawks v Chicago Bears

CHICAGO, IL - DECEMBER 02: Russell Wilson #3 of the Seattle Seahawks is pushed out of bounds by Brian Urlacher #54 of the Chicago Bears on December 2, 2012 at Soldier Field in Chicago, Illinois.The Seattle Seahawks defeated the Chicago Bears 23-17 in overtime. (Photo by David Banks/Getty Images)

Seattle Seahawks v Chicago Bears

CHICAGO, IL - DECEMBER 02: Russell Wilson #3 of the Seattle Seahawks passes the ball as he's pressured by Brian Urlacher #54 of the Chicago Bearson December 2, 2012 at Soldier Field in Chicago, Illinois.The Seattle Seahawks defeated the Chicago Bears 23-17 in overtime. (Photo by David Banks/Getty Images)

Chicago Bears v Arizona Cardinals

GLENDALE, AZ - DECEMBER 23: Middle linebacker Brian Urlacher #54 of the Chicago Bears stands on the sidelines during the NFL game against the Arizona Cardinals at the University of Phoenix Stadium on December 23, 2012 in Glendale, Arizona. The Bears defeated the Cardinals 28-13. (Photo by Christian Petersen/Getty Images)