UFC fighter Allan Nascimento has died at the age of 34 after suffering an 'apparent heart attack' in his sleep. It comes just six weeks after the Brazilian's last fight in Las Vegas on June 20. He suffered a split decision loss to Mitch Raposo at UFC Vegas 119. A UFC statement read: 'This morning, Monday, August 3rd, our beloved flyweight fighter, Allan Nascimento, was found unresponsive after suffering an apparent heart attack in his sleep. Former UFC lightweight champion Charles Oliveira, who trained with Nascimento in Sao Paulo, posted an emotional tribute on social media.