Prominent American journalist Grant Wahl has died in Qatar after collapsing while covering the World Cup, sparking an outpouring of shock and grief across the sports world.

He “collapsed” while covering Friday’s Argentina-Netherlands match, a witness told CNN.

Qatar’s World Cup organizers said on Saturday that Wahl “fell ill” in the press area, where he received “immediate medical treatment on site.” He was then transferred to Hamad General Hospital, said a spokesperson for the Supreme Court Committee for Delivery and Legacy, the body responsible for planning the tournament.

“The entire US Soccer family is heartbroken to learn that we have lost Grant Wahl,” US Soccer said in a statement on its official Twitter account.

“Grant made soccer his life’s work, and we are devastated that he and his brilliant writing will no longer be with us.”

US Soccer praised Wahl’s passion and “belief in the power of the game to advance human rights,” and shared its condolences with Wahl’s wife, Celine Gounder, and his loved ones.

Gounder also posted the US Soccer statement on Twitter.

“I am so thankful for the support of my husband Grant Wahl’s soccer family and of so many friends who’ve reached out tonight. I’m in complete shock,” wrote Gounder, a former CNN contributor who served on the Biden-Harris transition Covid-19 advisory board.

US State Department spokesperson Ned Price said the department was in “close communication” with Wahl’s family. The World Cup organizers also said they were in touch with the US embassy “to ensure the process of repatriating the body is in accordance with the family’s wishes.”

Wahl had covered soccer for more than two decades, including 11 World Cups, and authored several books on the sport, according to his website.

He had just celebrated his birthday earlier this week with “a great group of media friends at the World Cup,” according to a post on his official Twitter account, which added: “Very thankful for everyone.”

In an episode of the podcast Futbol with Grant Wahl, published days before his death on December 6, he had complained of feeling unwell.

“It had gotten pretty bad in terms of like the tightness in my chest, tightness, pressure. Feeling pretty hairy, bad,” Wahl told co-host Chris Wittyngham in the episode. He added that he sought help at the medical clinic at the World Cup media center, believing he had bronchitis.

He was given cough syrup and ibuprofen, and felt better shortly afterward, he said.