Calvin Johnson will retire from the NFL - Pride Of Detroit
Detroit Lions great Calvin Johnson elected to Hall of Fame
Megatron: I'm content with what I did, not coming back - NBC Sports
Report: Lions' latest offer not enough for Hall of Famer Calvin
Deadline Detroit Terry Foster: Calvin Johnson Ready to Announce
Calvin Johnson - Wikipedia
NFL notes: Once again, Lions lose a star in his prime - The Boston
It's true: Lions' Megatron Calvin Johnson will retire from
Herman Moore believes Calvin Johnson will retire - Pride Of Detroit