​LAS VEGAS, NEVADA – JANUARY 14: Allan Nascimento of Brazil has his hands wrapped prior to his fight during the UFC Fight Night event at UFC APEX on January 14, 2023 in Las Vegas, Nevada. (Photo by Chris Unger/Zuffa LLC via Getty Images) | Zuffa LLC via Getty Images Ultimate Fighting Championship (UFC) Flyweight contender Allan Nascimento has died at the age of 34.UFC announced the heartbreaking news today (Mon., Aug. 3, 2026) on social media, revealing that Nascimento was found unresponsive after suffering an apparent heart attack in his sleep.“This morning, Monday, August 3rd, our beloved flyweight fighter, Allan Nascimento, was found unresponsive after suffering an apparent heart attack in his sleep,” UFC’s statement read. “Despite the efforts of the responding medical team, he was pronounced deceased at the scene.“Our thoughts and deepest condolences are with Allan’s family, friends, teammates, and loved ones during this incredibly difficult time.”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, 2026Nascimento (22-7) was one of the brightest contenders in UFC’s Flyweight division, though his run in the promotion was repeatedly slowed by canceled fights.“Puro Osso” made his UFC debut against Tagir Ulanbekov, losing an extremely close split decision. He then rebounded with four straight wins, including two “Performance of the Night” submission victories, establishing himself as one of the most dangerous grapplers in the 125-pound division.Nascimento was last in action against Mitch Raposo, losing by split decision.A longtime member of the legendary Chute Boxe team in Brazil, Nascimento was also a close friend and training partner of former UFC Lightweight champion Charles Oliveira.Everyone at MMAmania.com sends our deepest condolences to Nascimento’s family, friends, teammates and loved ones during this devastating time.