5 NFL players who retired at the peak of their careers
Detroit Lions: Calvin Johnson Officially Retires from NFL
Ex-Detroit Lions WR Calvin Johnson making 'Mega' impact in retirement
Detroit Lions: Calvin Johnson wanted to be drafted by hometown Falcons
Detroit Lions owner hopeful about repairing rift with Calvin Johnson
Pat McAfee Presents Theory of Lions' Calvin Johnson Curse
Detroit Lions receiver Calvin 'Megatron' Johnson retires from the NFL at age 30 - Los Angeles Times
Athletes who retired early
Lions Ease Past Bears to Correct Course Toward the Playoffs - The New York Times
21 Athletes Who Retired Earlier Than Expected
Calvin Johnson: Lions must pay back signing bonus to repair relationship