Calvin Johnson's retirement leaves a huge void for the Lions - ESPN
Calvin Johnson Is Retiring From the NFL
Lions Legend Calvin Johnson elected to Pro Football Hall of Fame
ESPN report says Calvin Johnson told Jim Caldwell about retirement
Calvin Johnson retiring from NFL: report
Detroit Lions' Calvin Johnson joins this list of star athletes
Notes: Calvin Johnson's retirement killed the NFL goal-line fade
Ex-Lion Calvin Johnson: 'I'm not coming back'
Scott Linehan fondly remembers his time coaching Lions' Calvin Johnson
NFL Notebook: Lions' Calvin Johnson retires - West Central Tribune
Calvin Johnson - Wikipedia
ESPN: Calvin Johnson Retiring From The NFL - CBS Detroit
Five Detroit Lions players named to ESPN all-decade NFC North team
Report: Calvin Johnson told Caldwell he's retiring