Ultimate Fighting Championship flyweight Allan Nascimento died of an apparent heart attack Monday morning, the company announced. The 34-year-old Brazilian “was found unresponsive after suffering an apparent heart attack in his sleep,” UFC said in a social media post. The UFC announced Nascimento's Monday morning death in a social media post. Instagram/UFCNascimento last fought just six weeks ago at UFC 119 in Las Vegas, where he had a three-round, split decision loss. Born in Sao Paulo, Nascimento began his professional career in 2011 and competed in fighting promotions like RIZIN and Legacy FC before signing with UFC in 2021.