Chicago Bears running back Marion Barber is tackled by Denver Broncos free safety Rahim Moore (26) during an NFL game in Denver between the Denver Broncos and the Chicago Bears on Dec. 11, 2011. Barber posted on the team's website Friday that he plans to retire. It comes one day after Michael Bush signed a four-year, $14 million contract to be part of a backfield that includes disgruntled Pro Bowl running back Matt Forte.

AP file photo by Jack Dempsey    (Click on picture for larger image.)

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