49ers' Justin Smith calls it quits after stellar 14-year career
Justin Smith Announces Retirement from NFL
Demaryius Thomas announces retirement from NFL
NFLPA Selects New Executive Director to Replace DeMaurice Smith
Vikings Linebacker Announces Abrupt Retirement at Age of 24
Former KC Chiefs quarterback Alex Smith announces retirement from NFL
Brian Urlacher officially announces retirement from the NFL
Breaking Down San Francisco 49ers' Best Replacement Options for
Patrick Willis' Shock Retirement Marks Official End of Jim
Justin Smith Announces Retirement from NFL
49ers lineman Justin Smith announces retirement after 14 seasons
Santa Cruz's Andy Levitre announces NFL retirement – Santa Cruz