Odd and premature sports retirements

� ST. LOUIS, MO - DECEMBER 16: Brett Favre #4 of the Green Bay Packers laughs while on the sideline against the St. Louis Rams at the Edward Jones Dome December 16, 2007 in St. Louis, Missouri. The Packers beat the Rams 33-14. (Photo by Dilip Vishwanat/Getty Images)

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The Detroit Lions announced Tuesday that WR Calvin Johnson has retired. Johnson, who walks away at age 30, signed a 7-year contract extension in 2012 worth $113.5 million. Here's a look back at some other odd, abrupt or premature retirements by star athletes over the years.

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