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OAKLAND, CA - NOVEMBER 28: Ricky Williams #34 of the Miami Dolphins in action against the Oakland Raiders at Oakland-Alameda County Coliseum on November 28, 2010 in Oakland, California. (Photo by Ezra Shaw/Getty Images) *** Local Caption *** Ricky Williams

Odd and premature sports retirements

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.