UFC fighter Allan Nascimento dead at 34 after apparent heart attack

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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.

LAS VEGAS, NEVADA - JUNE 20: Mitch Raposo reacts after a victory against Allan Nascimento of Brazil in a flyweight fight during the UFC Fight Night event at Meta APEX on June 20, 2026 in Las Vegas, Nevada.  (Photo by Chris Unger/Zuffa LLC)

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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."

The Brazilian compiled a 22-7 professional record and went 4-2 inside the Octagon, with 15 of his 22 career victories coming by submission.

After coming up short via split decision against Tagir Ulanbekov in his 2021 UFC debut, Nascimento rattled off four straight victories over Jake Hadley, Carlos Hernandez, Jafel Filho and Cody Durden. 

Nascimento earned his first Performance of the Night bonus by submitting Hernandez with a first-round rear-naked choke in January 2023, then added a second in November 2025 with a second-round anaconda choke against Durden.

LAS VEGAS, NEVADA - JUNE 20: (L-R) Allan Nascimento of Brazil punchesMitch Raposo in a flyweight fight during the UFC