Jason Collins, the NBA's first openly gay player who now serves as an ambassador for the league, is undergoing treatment for a brain tumor, his family said Thursday. Collins announced he was gay in 2013, becoming the first publicly gay athlete to play in any of the four main North American sports leagues. He retired in 2014 after a 13-year career that included stops with the New Jersey Nets, Memphis, Minnesota, Atlanta, Boston, Washington and back to the Nets after they moved to Brooklyn.

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