UFC flyweight competitor Allan Nascimento has passed away at the age of 34 after an apparent heart attack. He was found unresponsive on Monday after seemingly suffering a heart attack in his sleep. Today's top videos STORY CONTINUES BELOW‘This morning, Monday, August 3, our beloved fighter and exemplary flyweight Allan Nascimento was found unresponsive after suffering an apparent heart attack in his sleep.’ Allan Nascimento. Pic: Chris Unger/Zuffa LLCThey added: ‘Despite the efforts of the responding medical team, he was pronounced deceased at the scene.