Leah Smith, who documented her four-year battle with a rare form of cancer on TikTok, died today, according to posts by her mother and boyfriend on the site. She was 22.

“I’m sad to say that she passed away today around half-eleven this morning,” her boyfriend Andrew Moore said in a video posted to Smith’s TikTok page. “I just want to say thank you to everyone. All your comments did help, like, she did actually read all of them. Anyone who said anything nice ever, it means more than you realize.”

Smith, who lived in Liverpool, had Ewing Sarcoma, a type of bone cancer that impacts young adults and children more often than it does adults. She was first diagnosed after she lost feeling in one of her legs. On TikTok she said she wanted to show people “my life living with cancer – the ups and downs of it.”

Millions watched her videos and wished her well.

“We are are all so truly heartbroken without Leah,” wrote her mother Vikki Smith in another TikTok post. “We will never forget her.”