Died of complications caused by long-term hypoxia and insufficient blood supply to the brain. According to relevant information, Otto, an American college student released by North Korea, was released when the situation on the Korean Peninsula became tense. The mystery of Warmbier's death has recently been the focus of attention. The autopsy results released by Hamilton County Coroner's Office in Ohio on the 27th showed that Warmbier died of complications caused by long-term hypoxia and insufficient blood supply to the brain.