One of the 12 boys who were rescued in 2018 from a Thai cave, Duangpetch Promthep, passed away in the UK. .
Although the exact cause of death is unknown, the teenager is said to have suffered a head injury.
He was 17 when he enrolled in the Leicester Brooke House College Football Academy.
The Thai boys' football team, led by Promthep, spent two weeks trapped in a cave in the Chiang Rai province along with their coach.
His mother informed the team at the Wat Doi Wao temple in Chiang Rai, where he was raised. His cave rescue team teammates who are also on social media have posted the news.
On Wednesday, the temple posted condolences to Promthep, also known as Dom, on Facebook. The post, which included pictures of the football team with monks, concluded with the words "May Dom's soul rest in peace.".
A Thai non-profit organization called Zico Foundation, which had assisted Promthep in obtaining a scholarship to study in England, also posted its condolences on Facebook.
Promthep played football for the Wild Boars (Moo Pa in Thai), a group of adventurers who entered the Tham Luang cave on June 23, 2018, only to become trapped by oncoming floodwaters.
His teammates were between the ages of 11 and 16, and he was 13 at the time.
Two weeks later, after a dramatic search and rescue operation involving almost 100 Thai and foreign divers, the boys and their coach were found. While under the effects of the drug ketamine, they were saved.
The team loved visiting Tham Luang, the fourth-largest cave system in Thailand.
The extraordinary story of the rescue made headlines all over the world, and many books and films were later produced to tell it again, including a six-episode miniseries that Netflix released last year.