The gymnast's paternal aunt died 'unexpectedly,' she said.
The 24-year-old gymnast withdrew from four competitions in the Tokyo Olympics due to mental health struggles.
The event was the gymnast's final chance to compete in the Tokyo Olympics.
The event marks the American gymnast's last opportunity to compete in the Tokyo Olympics.
Biles dropped out of the individual vault and uneven bars events on Sunday.
Taking Biles' place is MyKayla Skinner, who had the fourth highest score in the vault during qualifications.
The gymnast exited the team and all-around competitions earlier this week.
Sunisa 'Suni' Lee won a gold medal for women’s individual all-around gymnastics at the Tokyo Olympics as Simone Biles cheered her on!
On ET's The Download, the first posters for the Lady Gaga film ‘House of Gucci,’ and Blake Shelton reveals new wedding day details.
Simone Biles took to Twitter to thank fans for their support following her decision to exit the Olympics.
Biles received a slew of support after Biles exiting the gymnastics competitions at the Tokyo Summer Olympics.
On Thursday, the 21-year-old gymnast will compete for a medal after Biles stepped down.
On ET's The Download, Michael Phelps voices his support for Simone Biles, plus J.Lo and Ben feel like they were 'made for each other.’
Simone Biles’ boyfriend, Jonathan Owens, is publicly praising the gold medalist as she exits more Olympics events.
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