Brown, who was not on a roster during the 2011 campaign, spent eight seasons in Chicago and recorded 43.5 career sacks with the Bears – the fourth highest total in franchise history.
Brown started 123 of 143 regular-season games played. He recorded 412 tackles, 59 tackles for losses, 45.5 sacks, five interceptions, 16 forced fumbles, 12 fumble recoveries during his career.
A locker room favorite during his tenure in Chicago, Brown was a major contributor for one of the NFL's top defensive clubs of the past decade. As a starting end on the 2006 Bears team that reached the Super Bowl, Brown recorded 47 tackles, six sacks and two interceptions. Brown's final pro season was a member of the New Orleans Saints in 2010.
The Bears will honor Brown before Thursday's preseason opener at Soldier Field against the Denver Broncos.