A 17-year-old prisoner was found unconscious during a morning check. The previous night, he had been struck on the chin multiple times by one of the other inmates. The patient remained unconscious and eventually died after nearly 1.5 months of care. The primary task of the forensic pathological examination was to investigate the events leading to his death; therefore, it was necessary to examine whether there was a connection between the abuse and eventual death. In our case, the key element was the repetitive, mild-to-moderate force in abuse, resulting in grade I traumatic diffuse axonal damage. Due to progressive brain edema, aspiration subsequently developed, which eventually resulted in irreversible hypoxic damage of the brain.