Former Packers DB Morgan Burnett announces retirement from NFL
Former Browns linebacker Jamie Collins retires from NFL after 12 year career - A to Z Sports
2011 Draft Class Slowly Fading Away”: NFL World Stunned After 7x Pro Bowler Announces Sudden Retirement - EssentiallySports
Carl Nassib, first openly gay player to play in NFL games, announces his retirement
NFL: Browns lose lineman great Joe Thomas to retirement
BREAKING: Former Green Bay Packers Starter Announces Retirement Midseason
Players who have come out of retirement
Former Texans LB Christian Kirksey retires
Former Browns S T.J. Ward announces retirement