Odd and premature sports retirements

�­HOUSTON - APRIL 30: Center Yao Ming #11 of the Houston Rockets in Game Six of the Western Conference Quarterfinals during the 2009 NBA Playoffs at Toyota Center on April 30, 2009 in Houston, Texas. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Ronald Martinez/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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