The mixed martial arts world is mourning the loss of UFC flyweight fighter Allan Nascimento who 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. 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, 2026Fighting out of Sao Paulo, Brazil, Nascimento held a pro MMA record of 22-7. Most recently, Nascimento lost a split decision to Mitch Raposo at UFC Vegas 119 in June.