The Dallas Cowboys signed former Buffalo Bills free agent linebacker Keith Rivers to a one-year contract. Rivers has played seven seasons. He's a former Cincinnati Bengals first-round pick from USC and had 185 tackles in three seasons. He was traded to the New York Giants in 2012 for a fifth-round pick. Rivers had 83 tackles in two seasons. He signed with the Bills last year, but was cut last month after making 16 tackles in 12 games. Follow me on Twitter: @RavensInsider Aaron Wilson covers the Ravens for The Baltimore Sun