NFL Star Calvin Johnson Retiring
Detroit Lions star WR Calvin Johnson retires after 9 seasons
Goodbye Megatron: Lions announce that Calvin Johnson is retiring – WJR-AM
Lions' Calvin Johnson mulls retirement
Calvin Johnson admits Lions' struggles played a role in his early retirement
Calvin Johnson on concussions, injuries - Sports Illustrated
Detroit Lions' Calvin Johnson is retiring and is 'at peace with it'
Calvin Johnson Announces Retirement
Calvin Johnson pens letter to Lions fans: 'Michigan will forever be my home' - Pride Of Detroit