Norris joined the Bears coaching staff in 1999 after a four-year tenure with the Tennessee Oilers (1995-98). In addition to coaching 12 seasons in the NFL, Norris spent 26 years in the college ranks including an 11-year stay with Oklahoma (1973-83).
"Rex has been a valuable contributor to our staff both on and off the field," Chicago Bears head coach Dick Jauron said. "He is a tireless worker who has done a tremendous job both coaching veterans and developing young players. We were lucky to have him with us for four years and wish he and his family the very best."
Chuck Bullough, who is the assistant defensive line and special teams coach, is the frontrunner to fill the hole left by Norris. Bullough was nearly named the linebackers coach last season, until the team decided to go with the more experienced Gary Moeller.
There is an outside shot that the team could also shift Moeller to d-line coach, which is were he started his coaching career, and go after Mike Singletary to be the linebackers coach.