Her death was confirmed by the Cuban National Sports Institute, who said the teenager had been inflicted with head injuries by the equipment at a track and field stadium in the country.

"We share this unbearable pain with her family," said Osvaldo Vento, President of the Cuban National Sports Institute.

Osorio was fourth in the women's hammer throw at the 2018 Youth Olympic Games in Argentina and took bronze at the Pan American Under-20 Championships in 2019.

American hammer thrower Gwen Berry paid tribute to the young talent on Twitter.

"Wow, sending love to her family during this time," said Osorio.

"This is so sad."

The International Olympic Committee released a statement expressing its condolences for the fallen thrower.

"We learnt of the tragic death of Youth Olympian Alegna Osorio from Cuba following a training accident," it read.

"Her shining performance at the Youth Olympic Games Buenos Aires 2018 remains in our memories. 

"On behalf of the entire Olympic Movement, I extend my deepest and heartfelt condolences to her family, all her friends and the National Olympic Committee at this difficult time."

She was put into a coma following the accident in April, which was allegedly caused by an athlete throwing the hammer incorrectly, breaking Osorio's skull, according to Cuban athlete Gustavo Trujillo and reported by Cubita NOW.

This athlete was not part of the Cuban national team but was given permission to train with coach Eladio Martin Hernandez Gonzalez at the stadium by Athletics Commissioner and deputy of the Cuban Communist Party, Yipsi Moreno Gonzalez.