“…Custodial death refers to the death of an individual who is in prison or while under custody, [ 1 ] which can be attributed to natural diseases or causes, violence, poisoning, or even accidents. [ 2 , 3 ] Unfortunately, at present, the statistical data on custodial deaths in China are limited. Here, we present the case of a prisoner who died unexpectedly, although he appeared to be healthy while in custody.…”