A UFC flyweight fighter has passed away. The company announced on Monday that Allan Nascimento, 34, has passed away after suffering from an apparent heart attack. “This morning, Monday, August 3rd, our beloved flyweight fighter, Allan Nascimento, was found unresponsive after suffering an apparent heart attack in his sleep,” UFC announced in a statement. This 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, 2026