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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.
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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.
Nascimento last competed on June 20, 2026, falling to Mitch Raposo via split decision in what became the final fight of his career.
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Outside the Octagon, Nascimento built an accomplished career on Brazil’s regional circuit while training out of the renowned Chute Boxe Diego Lima gym alongside former UFC lightweight champion Charles Oliveira.
Nascimento spent more than a decade pursuing his UFC dream before emerging as one of the promotion’s rising flyweight contenders.
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His sudden death, coming just weeks after his final walk to the Octagon, leaves the MMA world mourning a fighter who still had much more to give.
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