UFC fighter Allan Nascimento has died at the age of 34 after suffering a suspected heart attack in his sleep. In a statement, the UFC said Nascimento was found unresponsive on Monday morning after suffering a medical episode overnight. “This morning, Monday, August 3rd, our beloved flyweight fighter, Allan Nascimento, was found unresponsive after suffering an apparent heart attack in his sleep,” the company said on social media. He trained alongside former UFC lightweight champion Charles Oliveira, who has since paid tribute to the athlete. “I’m so grateful to have had you by my side, brother, through training, the tough times, and the good times hanging out.