The cause of death is yet to be revealed, reports E! Online.
According to the reports, the coroner had an autopsy scheduled for today.
DuShon was a film, television, commercial and voice-over actress who also graced the stages of many Chicago theatres.
Brown was a veteran of Chicago theatre. She worked as a crisis counsellor at a Chicago high school and led its drama program before winning the role of Connie on 'Chicago Fire'. She played the assistant to Chief Boden, played by Eamonn Walker.
The actress also had a recurring role as nurse Kattie Welch in 'Prison Break' and one-time guest spots on 'Empire' and 'Shameless'.