The Panthers have decided not to place their franchise tag on running back DeAngelo Williams, according to a source. Carolina will either tag center Ryan Kalil or defensive end Charles Johnson, which will allow Williams to become an unrestricted free agent and potentially leave the team. Kalil, 25, is coming off his second straight Pro Bowl season. Johnson, 24, led the Panthers with 11? sacks. A first-round pick in 2006, Williams holds the franchise mark for career rushing yards (4,211) and rushing touchdowns (31).