Phakhapong Tanyakan died on 17 October - and his family was told the cause of death was a sudden cardiac arrest.
Yet his family became suspicious - because he had previously described brutal treatment at the school.
They secretly had a new autopsy done - revealing bruises, broken ribs and many of his vital organs missing.
What happened?
Phakhapong Tanyakan was a first year student at the Armed Forces Academies Preparatory School.
When he suddenly died in October the army gave cardiac arrest as the cause of death.
