British authorities came to this conclusion after investigating why this teenager died in Britain in February this year.
The investigation began on 22 February and ended on 4 October. The results were published in the press on 28 October.

Duangpetch Promthep, one of 12 boys rescued from a Thai cave in 2018, committed suicide in England. Photo: Facebook/Supatpong Methigo
Duangpetch Promthep, 17, captain of a Thai children’s football team, was stranded with his coach for two weeks after floodwaters filled Tham Luang Nang Non cave (Chiang Rai Province, Thailand) in June 2018.
Promthep joined the Brook House College football academy in the English city of Leicester late last year. Zico Foundation is a Thai non-profit organization that helped Promthep win a scholarship to study abroad in the UK.
On 12 February, Promthep was found unconscious in his dormitory room and died in hospital two days later.

Duangpetch Promthep (centre) and relatives after being rescued from a cave in Chiang Rai province in 2018. Photo: AP
dai bbc On 28 October a senior investigator was quoted as saying: “Promthep was not brought to the attention of mental health authorities and it is unknown why he committed suicide. It is difficult to predict or prevent it.”
Police ruled out the possibility that his death was suspicious. radio cna The police statement quoted: “Police found no evidence of third party involvement or suspicious circumstances.”
Following his death in England, Promthep’s family asked for help in repatriating the teenager’s body to Thailand. However, due to financial reasons, Promthep’s funeral was held in Leicester. After that, coach Kiatisuk Senamuang repatriated the remains of young player Promthep in early March this year.
On June 23, 2018, the Wild Boar youth football team set out to explore Tham Luang Cave and were trapped by rapidly rising flood waters.
At the time, Promthep was 13 years old, while his peers were between 11 and 16 years old. When rescuers reached the group, Promthep was the first to respond.
The rescue attracted worldwide attention, inspiring several films and books.