Fighter Allan Nascimento was found unresponsive after apparently suffering a heart attack in his sleep, the UFC said and was pronounced dead at the scene.
https://www.foxnews.com/sports/ufc-fighter-allan-nascimento-dead-34-after-apparent-heart-attack
https://www.foxnews.com/sports/ufc-fighter-allan-nascimento-dead-34-after-apparent-heart-attack