(Renton, WA) -- Tweets of tribute are pouring in, after Marshawn Lynch's agent confirmed the star running back is retiring from the Seahawks. Doug Hendrickson tweeted his congratulations and gratitude to "Beast Mode," saying working for Lynch over the past nine years has been a journey he will cherish. Lynch tweeted his intention to retire during the Super Bowl, posting only a pair of neon-green football shoes hanging over a wire and a peace-sign emoji. Lynch spent six of his nine NFL seasons with the Seattle Seahawks, whose owner, Paul Allen, tweeted his thanks for "so many memorable runs and quakes."