Jason Collins, who played 13 NBA seasons, is undergoing treatment for a brain tumor, according to an announcement from the league. Collins, 46, became the first openly gay active athlete across the four major sports in North America when he came out in a 2013 issue of Sports Illustrated.

"Jason and his family welcome your support and prayers and kindly ask for privacy as they dedicate their attention to Jason's health and well-being," the NBA said in a statement .

Collins was originally selected by the Houston Rockets with the No. 18 pick in the 2001 NBA Draft . However, Collins ended up being traded to the Nets on draft night. The center played in 735 career games with the Memphis Grizzlies , Minnesota Timberwolves , Boston Celtics , Atlanta Hawks , and Washington Wiz

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