Casserly: Mock Draft 3.0
How will notable free-agency acquisitions affect April's NFL draft? Charley Casserly projects the first round. More ...
Barber finishes his NFL career with 4,780 yards with 53 touchdowns.
Barber's decision comes one day after Michael Bush signed a four-year, $14 million contract to be part of a Chicago backfield that includes disgruntled Pro Bowl running back Matt Forte.
Barber, who had little to say to reporters during his only year in Chicago, told the Bears' official website: "I want to thank everyone who gave me the opportunity to play, and I'm very thankful to have had the chance to suit up for two of the NFL's most storied organizations."
"I want to thank everyone who helped me become a better player," Barber said. "I owe a lot to a lot of coaches, and am also very grateful to the owners and organizations I played for. Last but not least, I want to thank the fans for the support and inspiration they gave me."
The Associated Press contributed to this report.