Birkett: There's a chance Lions, Calvin Johnson mend fences in
Lions WR Calvin Johnson gives jerseys off his back - The San Diego
Agent: No timetable for Calvin Johnson decision - NBC Sports
Calvin Johnson: Lions told him to change concussion story
Calvin Johnson - Wikipedia
NFL notes: Calvin Johnson tells Lions he's retiring, report says
Detroit Lions star WR Calvin Johnson retires after 9 seasons
Calvin Johnson content in retirement, not 'treated the way I
Calvin Johnson: Detroit Lions WR retires - Sports Illustrated