UFC Fighter Dies Suddenly of Heart Attack at 34

A 34-year-old UFC fighter died of a heart attack on Monday.

Flyweight fighter Allan Nascimento reportedly died in his sleep.

The São Paulo native would have turned 35 this September, ESPN Brazil reported.

“This morning, Monday, August 3rd, our beloved flyweight fighter, Allan Nascimento, was found unresponsive after suffering an apparent heart attack in his sleep. Despite the efforts of the responding medical team, he was pronounced deceased at the scene,” the UFC said on Monday.

“Our thoughts and deepest condolences are with Allan’s family, friends, teammates, and loved ones during this incredibly difficult time,” the UFC said.

This morning, Monday, August 3rd, our beloved flyweight fighter, Allan Nascimento, was found unresponsive after suffering an apparent heart attack in his sleep. Despite the efforts of the responding medical team, he was pronounced deceased at the scene.

Our thoughts and deepest… pic.twitter.com/vlaBaBOyJr

— UFC (@ufc) August 3, 2026

“Nicknamed “Puro Osso,” which translates to “All Bones” because he was so lean as a teenager, Nascimento (22-7) was 4-2 in six appearances in the UFC. He signed with the promotion in 2021. Both of his losses came by split decision,” ESPN reported.

“He trained out of the renowned Chute Boxe team, under head coach Diego Lima,” ESPN reported.

ALLAN NASCIMENTO DEAD AT 34@slickricksports reports the sports world is mourning UFC flyweight Allan Nascimento, who died at age 34 after an apparent heart attack. Nascimento was found unresponsive Monday morning, just weeks after his most recent UFC bout in June.@lfs6b… pic.twitter.com/97WPXJyVsI

— Real America's Voice (RAV) (@RealAmVoice) August 4, 2026

Fans and athletes were shocked to find out about Allan Nascimento’s untimely death.

Terrible news about Allan Nascimento. Far too young. He was a blast to watch. https://t.co/hnm08nkIVj

— RJ Clifford (@RJcliffordMMA) August 3, 2026

Charles Oliveira reacts to the sudden passing of his close friend and teammate, Allan Nascimento.

“Today I lost a brother. Thank you for always being there, for sharing the mat, the track, for the words. I only have gratitude for having you by my side, brother, in training,… pic.twitter.com/AOH5AA8xkv

— MMA Orbit (@mma_orbit) August 3, 2026

UFC flyweight Allan Nascimento dead at 34 https://t.co/Ay40CTNAO8

— MMA Fighting (@MMAFighting) August 3, 2026

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