Calvin Johnson visits Lions OTAs, says he's a fan of Dan Campbell
Wood: Johnson handled retirement with class
Detroit Lions receiver Calvin Johnson ends brilliant NFL career at
A Look Back at Calvin Johnson's Shocking Retirement
Calvin Johnson: 'No, I'm not coming back'
Retired NFL players look to invest in marijuana businesses, push
The best athletes to retire in their prime
Harvard University, NFL Hall of Fame WR Calvin Johnson
Calvin Johnson Is Mulling Retirement at 30 Years Old Because He's
Calvin Johnson: Career retrospective
Inside the difficult art of closing out an NFL game
Calvin Johnson, Barry Sanders and 11 other athletes who retired
BJ Raji takes 'hiatus' from Green Bay Packers and NFL
NFL: Why Calvin Johnson is aiming for greatness - Mike Revell