UFC CEO Dana White, President Donald Trump and others recap the planning behind the historic mixed martial arts event on the White House lawn in the new Fox Nation documentary, โ€˜UFC Fight House: The Making of the Biggest Fight in History.โ€™

UFC flyweight Allan Nascimento has died at age 34, the UFC announced Monday.

Nascimento was found unresponsive after suffering an apparent heart attack in his sleep, according to a statement released by the organization.

Despite efforts by emergency responders, he was pronounced dead at the scene, the UFC said.

In a post shared on X, the UFC said: "Our thoughts and deepest condolences are with Allan's family, friends, teammates, and loved ones during this incredibly difficult time."

This is a developing story. Please check back for updates.

Emma Bussey is a breaking news writer for Fox News Digital. Before joining Fox, she worked at The Telegraph with the U.S. overnight team, across desks including foreign, politics, news, sport and culture.ย 

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