UFC flyweight Allan Nascimento dies at the age of 34, the promotion announces. Multiple outlets report he suffered an apparent heart attack in his sleep, was found unresponsive at his home, and was pronounced dead at the scene despite emergency medical efforts.

Nascimento, nicknamed “Puro Osso,” is described as a respected Brazilian competitor in the flyweight division. Sources note he turned professional in 2011, reached the UFC after impressing on Dana White’s Contender Series in 2018, and joined the promotion in 2021. During his UFC run, he is credited with a 4–2 record and earning Performance of the Night bonuses in some coverage.

Several reports mention his most recent fight: a narrow split-decision loss to Mitch Raposo in June. While outlets largely align on the circumstances of his death and his UFC tenure, they differ in emphasis—some focus on his record and reputation, while others highlight the shock of his sudden passing and upcoming scheduled appearances reported prior to his death. Fans and fighters across MMA and related communities issue tributes following the announcement.