Fatima Ali, who was voted by fans of the television show “Top Chef” as their favorite contestant of Season 15, died on Friday at her family’s home in San Marino, Calif. She was 29.

A brother, Mohammad Ali, said the cause was cancer.

While her season of the reality culinary competition show was airing, Ms. Ali announced in 2017 that she had Ewing’s sarcoma, which affects bone and soft tissue.

Ms. Ali chronicled her fight against the rare form of cancer on social media. Interspersed with pictures of food on her Instagram page were photos of her in the hospital, her head bald from chemotherapy treatments in some and dyed platinum blond in others.

“I know it’s been ages since I posted and most may have figured out why,” Ms. Ali wrote on Instagram on Jan. 10. “I’m sick and unfortunately I’m getting sicker. Right now all I need are prayers; prayers that are simple.”