Calvin Johnson retires: 'I have played my last game of football' - ABC7 Chicago
Calvin Johnson tells Detroit Lions 2015/16 NFL season was his last, NFL News
Detroit Lions receiver Calvin 'Megatron' Johnson is retiring - Baltimore Beatdown
Calvin Johnson Announces Retirement
Calvin Johnson Announces Retirement from NFL, News, Scores, Highlights, Stats, and Rumors
Detroit Lions wide receiver Calvin Johnson expected to retire
Detroit Lions' Calvin Johnson is retiring and is 'at peace with it'
Calvin Johnson's Experience with the NFL and Traumatic Brain Injury
Detroit Lions receiver Calvin Johnson ends brilliant NFL career at age 30, Detroit Lions
The Detroit Lions made a major mistake not trading Calvin Johnson - Pride Of Detroit