Chicago Bears running back Marion Barber has told the team's website he plans to retire.

His decision comes one day after Michael Bush signed a 4-year, $14 million contract to be part of a backfield that includes disgruntled Pro Bowl running back Matt Forte.

The 28-year-old Barber spent his first six NFL seasons with the Dallas Cowboys before signing with the Bears in 2011. He was a backup to Forte last season and then saw extensive duty when Forte was injured in early December.

Barber had six touchdowns and 422 yards rushing, but will be remembered for two gaffes in a costly loss at Denver when he ran out of bounds as the Bears were trying to kill the clock, and then fumbled in overtime.