The 36-year-old Williams played 13 regular-season games with Baltimore after signing as a free agent before the 2012 season. The 13-year veteran played previously for the Philadelphia Eagles and Cincinnati Bengals.
Ravens general manager Ozzie Newsome said, "Bobbie is first-class in every way. ... We thank him for helping us win the championship."
The 6-foot-4, 345-pound Williams started six games for the Ravens and was a positive influence in the locker room.
Copyright 2013 by The Associated Press