Steve Fairchild is back with the Buffalo Bills, hired as the team's offensive coordinator Wednesday and given the task of improving one of the NFL's worst offenses. Fairchild, who spent the past three seasons as the St. Louis Rams' offensive coordinator, broke into the NFL as the Bills' running backs coach in 2001-02. He becomes the second assistant hired by Dick Jauron, named head coach Monday. The former Chicago Bears head coach replaced Mike Mularkey, who abruptly resigned two weeks ago.