“This morning, Monday, August 3rd, our beloved fighter and exemplary flyweight, Allan Nascimento, was found unresponsive after suffering an apparent heart attack in his sleep,” the UFC said. THIS CONTENT IS RESERVED FOR SUBSCRIBERS ONLYArticle contentThis morning, Monday, August 3rd, our beloved flyweight fighter, Allan Nascimento, was found unresponsive after suffering an apparent heart attack in his sleep. Our thoughts and deepest… pic.twitter.com/vlaBaBOyJr — UFC (@ufc) August 3, 2026Fighter had 22-7 MMA recordNascimento’s last fight in the UFC was in June during the UFC Fight Night: Kape vs. Horiguchi event, losing to Mitch Raposo via split decision. Nascimento lost to Raulian Paiva in a split decision, per the New York Post. He eventually made his UFC debut on Oct. 30, 2021, at UFC 267 in a losing affair against Tagir Ulanbeko.