Detroit Lions' Calvin Johnson joins this list of star athletes
Lions' Calvin Johnson makes 'difficult decision' to retire
NFL on FOX - If Calvin Johnson played another five years after he
Calvin Johnson retires from NFL
Calvin Johnson - Wikipedia
When Calvin Johnson retired, he left a Hall of Fame legacy that
Where is Calvin Johnson now? What the Lions legend is doing after
Lions star WR Calvin Johnson retires after 9 seasons – Daily Freeman
Calvin Johnson said he had at least 9 concussions and smoked weed
Calvin Johnson Announces Retirement - San Francisco News
Calvin Johnson to the Patriots? Don't bet on it, Lions say