UFC Fighter Allan Nascimento Dies in His Sleep After Apparent Heart Attack at 34
UFC flyweight Allan Nascimento died Monday at age 34 after reportedly suffering an apparent heart attack in his sleep.
Nascimento, a native of São Paulo, Brazil, would have turned 35 in September, ESPN Brazil reported. The fighter was found unresponsive, and the responding medical team later pronounced him deceased at the scene.
“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 Monday that the organization was mourning Nascimento and extended its condolences to those closest to him.
“Our thoughts and deepest condolences are with Allan’s family, friends, teammates, and loved ones during this incredibly difficult time,”
Nascimento’s death quickly drew attention across the MMA world. The UFC shared its statement as fans and fellow fighters reacted to the sudden loss.
His professional record was 22-7. ESPN reported that he went 4-2 across six UFC appearances after signing with the promotion in 2021. Both of his UFC losses came by split decision.
“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 also reported that Nascimento trained with the renowned Chute Boxe team under head coach Diego Lima.
“He trained out of the renowned Chute Boxe team, under head coach Diego Lima,”
Real America’s Voice reported that the sports world was mourning Nascimento and noted that he had died just weeks after his most recent UFC bout in June.
Fans also shared their grief. RJ Clifford described the news as terrible, said Nascimento was far too young, and remembered him as a fighter who was a blast to watch.
Charles Oliveira, identified in the source as Nascimento’s close friend and teammate, also reacted to the loss. In the post shared by MMA Orbit, Oliveira called Nascimento a brother and expressed gratitude for the time they spent together in training, on the mat, and on the track.
The sudden death of a fighter still competing at the highest level left fans and athletes struggling to process the news. Nascimento’s UFC record, his time with Chute Boxe, and the tributes from people who knew him were widely discussed after the announcement.
MMA Fighting also reported the death of the UFC flyweight at 34.
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
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
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

