Odd and premature sports retirements

� MELBOURNE, AUSTRALIA - JANUARY 21: Justine Henin of Belgium plays a forehand in her third round match against Svetlana Kuznetsova of Russia during day five of the 2011 Australian Open at Melbourne Park on January 21, 2011 in Melbourne, Australia. (Photo by Cameron Spencer/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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