UFC flyweight Allan Nascimento has died at age 34, the UFC announced Monday.

Nascimento was found unresponsive after suffering an apparent heart attack in his sleep, according to a statement released by the organization.

Despite efforts by emergency responders, he was pronounced dead at the scene, the UFC said.

In a post shared on X, the UFC said: “Our thoughts and deepest condolences are with Allan’s family, friends, teammates, and loved ones during this incredibly difficult time.”

This is a developing story. Please check back for updates.