Interest Successfully AddedWe'll notify you here with news aboutTurn on desktop notifications for breaking stories about interest? OffOnCultureHeadlines from ABC News LiveChris Unger/Zuffa LLC/Getty ImagesAugust 4, 2026, 10:50 AMBrazilian mixed martial artist and UFC flyweight Allan Nascimento has died after suffering an "apparent heart attack in his sleep," the promotion company announced on social media MondayNascimento was 34 years old, and last fought at a UFC event in June.Popular ReadsThis is a developing story. Please check back for updates.Popular Reads24/7 coverage of breaking news and live events