Odd and premature sports retirements

ORLANDO, FL - JANUARY 30: Apparel on display at the Bobby Jones booth at the 2010 PGA Merchandise Show at the Orange County Convention Center on January 30, 2010 in Orlando, Florida. (Photo by Scott Halleran/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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