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San Francisco 49ers: How Much Longer Will Justin Smith Play? | News, Scores, Highlights, Stats, and Rumors | Bleacher Report
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San Francisco 49ers on Twitter: "#OnThisDay in 2008, the #49ers signed free agent DL Justin Smith. 110 games, 43.5 sacks and five pro bowls later... http://t.co/1pUp79wfkD" / Twitter
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San Francisco 49ers defensive end Justin Smith to retire from National Football League - ABC7 San Francisco
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Packers vs. 49ers NFL injury report: Justin Smith returns, Joe Staley suffers bruised arm - SBNation.com
![San Francisco 49ers on Twitter: "#49ers DT Justin Smith, a five-time Pro Bowler, will retire from the NFL. #FarewellCowboy http://t.co/Y7D24Bao6d http://t.co/vpiTo3skCz" / Twitter San Francisco 49ers on Twitter: "#49ers DT Justin Smith, a five-time Pro Bowler, will retire from the NFL. #FarewellCowboy http://t.co/Y7D24Bao6d http://t.co/vpiTo3skCz" / Twitter](https://pbs.twimg.com/media/CFUDJCkXIAECdhD.jpg:large)