Buffalo Bills linebacker A.J. Tarpley announced his retirement from the NFL on Wednesday after just one season, citing a concerns over multiple concussions. The undrafted rookie announced his decision in an Instagram post. “After months of introspection, I am retiring from football. I suffered the 3rd and 4th concussions of my career this past season and I am walking away from the game I love to preserve my future health,” he wrote. Tarpley played in 14 games this past season, notching eight tackles and two interceptions. The undrafted free agent from Stanford is the latest player to retire early out of concerns for their health.