Charles, who will turn 28 in June, had been a restricted free agent entering the offseason, but once the Bills passed on tendering an offer to him, he became an unrestricted free agent at the start of the new league year. Because he was an RFA, however, he will not count in the compensatory draft pick formula for the Bills this offseason.
Acquired off of a practice squad during the 2013 season, Charles developed into a quality reserve in his three-year stint with the Bills. His best year came in 2014 when playing in a base 4-3 defense, when he accumulated 23 tackles and three sacks while playing 31 percent of defensive snaps.
Instead of tendering Charles, the Bills instead chose to tender fellow restricted free agent defensive lineman Corbin Bryant. That $1.67 million tender has not been signed, and the cap-strapped Bills will watch closely to see if Bryant receives any interest on the open market coming off of a solid 2015 season.