Bills' Kyle Williams likely headed to IR

Buffalo Bills defensive tackle Kyle Williams' injured knee isn't responding to treatment and may force the team to shut him down, head coach Rex Ryan announced Friday.

Ryan said it's unlikely Williams will be able to contribute again this season, which has led the team to strongly consider placing him on season-ending IR.

Williams has missed four straight games after getting hurt when a teammate rolled onto his left leg in a loss to the Cincinnati Bengals on Oct. 18.