Bills SS Aaron Williams tweeted that he underwent surgery Thursday.
Bills placed SS Aaron Williams (ribs) on injured reserve, ending his season.
Bills SS Aaron Williams (back) says he'll play in Thursday's game against the Browns.
Bills DB Aaron Williams left Sunday's game against the Ravens with a lower back injury in the fourth quarter and will not return.
Aaron Williams is expected to start at free safety in Sunday's opener against the Patriots.
The Bills have been impressed with DB Aaron Williams' conversion to safety.
Coach Doug Marrone has determined that Aaron Williams will play safety.
WGR 550's Joe Buscaglia expects the Bills to give Aaron Williams "one more crack" at becoming an NFL cornerback.
Bills CB Aaron Williams (knee) is listed as questionable for Sunday's game against the Rams.
Bills LCB Aaron Williams (knee) will "miss a few weeks," but is expected to play again this season.
Bills LCB Aaron Williams is undergoing tests on his ailing right knee Monday.
Bills CB Aaron Williams left Sunday's Week 9 game against the Texans with a knee injury.
Bills LCB Aaron Williams has allowed five touchdown passes this season, the most of any cornerback in the league.
The Bills' official site expects Aaron Williams to start at left cornerback.