UFC fighter Allan Nascimento has died at the age of 34 after suffering an apparent heart attack in his sleep.

Context

Nascimento was a Brazilian flyweight who had six fights in five years with the UFC.S2

Key points

• Nascimento was found unresponsive on Monday morning.S2

• He suffered an apparent heart attack while sleeping.S1S2

• Medical personnel attempted to revive him but were unsuccessful.S2

• His death has been confirmed by the UFC organization.S2

• Nascimento's career included multiple bouts in the UFC.S2

• He was known for his skills in mixed martial arts.S1

• The news has shocked the MMA community.S1

• Tributes are expected to pour in from fans and fellow fighters.S1

Why it matters

• The sudden death of a young athlete raises concerns about health issues in sports.S1

• It highlights the importance of medical screenings for athletes.S2

What to watch

• Monitor reactions from the MMA community and tributes to Nascimento.S1

• Watch for any statements from the UFC regarding athlete health protocols.S2