Chicago Bears RB Marion Barber says he's retiring
Former NFL Running Back Marion Barber Died of Heat Stroke – NBC 5
Former Bears running back Marion Barber III has died at the age of
Former Cowboys, Bears RB Marion Barber III Dies
Marion Barber was much more than a bruising football player
Former Dallas Cowboys RB Marion Barber III found dead aged just 38
Dallas Cowboys RB Marion Barber's Cause of Death Determined
Chicago Bears RB Marion Barber says he's retiring
ESPN - Former Dallas Cowboys and Chicago Bears RB Marion Barber