Bills starting right tackle Brad Butler announced his retirement on Thursday. Butler, 26, just completed his fourth NFL season. He majored in government studies at Virginia, and spent the 2008 offseason interning at Kemp Partners in Washington D.C. with former and late Bills quarterback and congressman Jack Kemp. "My passion for education, country and community is something that I am ready to devote my full attention to," Butler said in a statement released by the team. "I believe the best way to pursue these spheres of interest is to step away from the game of football at this point in my life."