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Former NBA player Jason Collins is receiving treatment for a brain tumor, his family announced.

In a first-person essay published in Sports Illustrated in 2013, Collins wrote about his sexuality and became the first openly gay player in any of the four major North American men's professional sports leagues.

At the time, Collins said his public admission was the first time he had spoken about that aspect of his personal life beyond his family and close friends.

"No one wants to live in fear. I've always been scared of saying the wrong thing. I don't sleep well. I never have," Collins wrote in 2013. "But each time I tell another person, I feel stronger and sleep a little more soundly. It takes an enormous amount of energ

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