Allan Nascimento, a mixed martial arts fighter, has died at 34, the Ultimate Fighting Championship said.

Nascimento died after having a heart attack while sleeping, according to the UFC.

The medical team tried to save him, but he was pronounced dead. The UFC is sending condolences to his family and friends.

Nascimento was from Brazil and had a record of 17 wins and 4 losses before joining the UFC.

He signed with the UFC in 2021 and lost his first fight, but then won four fights in a row.

Nascimento won four fights against Jake Hadley, Carlos Hernandez, Jafel Filho, and Cody Durden.

His last fight was against Mitch Raposo, who won and ended Nascimento's winning streak.

Nascimento was going to be a guest at the Charles Oliveira Experience on August 9.

The news of Nascimento's death was a shock to the UFC world.

Brazilian fighter Caio Borralho said Nascimento was kind and always in good spirits. He will be missed.

Charles Oliveira said he lost a brother and the pain is unbearable.

UFC correspondent Evelyn Rodrigues said Nascimento was one of the kindest people she knew. Rest in peace, Allan.

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