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Glenn Coffee was originally a 2009 third-round pick out of Alabama<p>Running back Glen Coffee played in 14 games during his rookie season in 2009, carrying the ball 83 times for 226 yards and a touchdown. He was used primarily as a backup to Frank Gore but the expectation was that his role would grow …

Read more at CBS Sports: http://www.cbssports.com/nfl/news/49er-who-retired-after-rookie-season-to-play-in-2017-spring-league-showcase/