Jason Collins, the NBA's first openly gay player, who went on to become a pioneer for inclusion and an ambassador for the league, has died, the NBA announced. He was 47.

Collins spent 13 years as a player in the league for six different franchises. He revealed in 2013 that he was gay, an announcement that came toward the end of his playing career.

Collins announced he was diagnosed with Stage 4 glioblastoma in December, which has an extremely low survival rate. In a statement through the NBA, the Collins' family said the former NBA player died "after a valiant fight with glioblastoma."

"Jason changed lives in unexpected ways and was an inspiration to all who knew him and to those who admired him from afar," Collins' family said. "We are grateful for the outpouring of love and prayers over the past eight months and for the exceptional medical care Jason received from his doctors and nurses. Our family will miss him dearly."

Just last week, Collins received the inaugural Bill Walton Global Champion Award at the Green Sports Alliance Summit. He was too ill to attend and his twin brother, former NBA player Jarron Collins, accepted for him.

"I told my brother this before I came here: He's the bravest, strongest man I've ever known," Jarron Collins said while accepting that award.

Jason Collins averaged 3.6 points and 3.7 rebounds in his career. He helped the New Jersey Nets reach two NBA Finals and in his best season averaged 6.4 points and 6.1 rebounds for them in 2004-05. He retired in 2014 after playing with the Brooklyn Nets from February to November 2014. 

"Jason Collins' impact and influence extended far beyond basketball as he helped make the NBA, WNBA and larger sports community more inclusive and welcoming for future generations," NBA Commissioner Adam Silver said in a statement. "He exemplified outstanding leadership and professionalism throughout his 13-year NBA career and in his dedicated work as an NBA Cares Ambassador. Jason will be remembered not only for breaking barriers, but also for the kindness and humanity that defined his life and touched so many others.

Jason Collins revealed his sexuality in a first-person account for Sports Illustrated in April 2013. 

"I'm a 34-year-old NBA center. I'm Black and I'm gay," he wrote in the opening of his first-person piece.

He was a free agent at the time, said he wanted to keep playing, and went on to play in 22 games with Brooklyn the following season.

"If I had my way, someone else would have already done this," he wrote at that time. "Nobody has, which is why I'm raising my hand."

His decision was widely lauded, with star players such as Kobe Bryant quickly speaking out in support of Collins. There was even support from the White House and former President Bill Clinton — whose daughter, Chelsea, went to Stanford with Collins. At Stanford, Collins was roommates with someone who was part of another American political dynasty, that being Joe Kennedy III, who spent eight years in Congress representing Massachusetts.

Collins, in the piece for Sports Illustrated, wrote that he realized he needed to go public about his sexuality when Kennedy walked in Boston's gay pride parade in 2012 — but Collins couldn't do the same.

Until then, Collins kept his feelings about gay rights close to the vest. He wore jersey No. 98 for the majority of his final three playing stints with Boston, Washington and Brooklyn — a nod to the year that Matthew Shepard, a gay college student in Wyoming, was killed. He also wore 46 in one game for the Nets, since it was the only jersey the team had available when he signed.

"In 2013, Jason changed sports forever by becoming the first active male athlete in a major North American team sport to publicly come out," the National Basketball Players Association said in a statement. "His courage shattered barriers, making him a global beacon of hope for the LGBTQ+ community. He worked relentlessly to foster inclusion in locker rooms, schools, and communities, challenging us all to be more empathetic."

Collins made nearly 61% of his shots in his career at Stanford, which remains a school record. He was an honorable mention selection for The Associated Press' All-America team in 2001, a few months before the Houston Rockets took him with the 18th pick in that year's NBA draft.

"It's a sad day for all of us associated with Stanford basketball when we lose one of the program's greats," former Stanford coach Mike Montgomery said. "We all have great memories of Jason and the kind of person he was. It's hard to separate Jarron and Jason because they thought so alike, but even though he was an identical twin, Jason was unique in his own way. The impact he had on Stanford was immense, as he could match up against anyone in the country because he was big, smart, strong and skilled, all while being a very bright and nice person."