FS Aaron Williams briefly exited the Bills' Week 3 game against the Chargers with a leg contusion, but returned to the game.
Aaron Williams left Sunday's opener with concussion-like symptoms.
The Bills' website confirms Aaron Williams will move to free safety this season.
Bills.com writer Chris Brown considers Aaron Williams a candidate to move to free safety this season.
Bills signed SS Aaron Williams to a four-year, $26 million extension through 2018.
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.