Non-invasive internal scans did not find any signs of fractures to his skull. A coroner's report stated that he died from an unknown injury causing lack of oxygen to the brain. Warmbier never regained consciousness and died on June 19, 2017, six days after his return to the United States when his parents requested his feeding tube be removed. He was taken to the University of Cincinnati Medical Center for immediate evaluation and treatment. He was repatriated to the United States and arrived in Cincinnati, Ohio, on June 13, 2017. He was freed later that month, still in a comatose state after 17 months in captivity. North Korean authorities did not disclose his medical condition until June 2017, when they announced he had fallen into a coma as a result of botulism and a sleeping pill.

Shortly after his sentencing in March 2016, Warmbier suffered a severe neurological injury from an unconfirmed cause and fell into a coma, which lasted until his death. He was convicted of attempting to steal a propaganda poster from his hotel, for which he was sentenced to 15 years of imprisonment with hard labor. On January 2, 2016, he was arrested at Pyongyang International Airport while awaiting departure from the country. Warmbier entered North Korea as part of a guided tour group on December 29, 2015.

In June 2017, he was released by North Korea in a vegetative state and died soon afterwards. Otto Frederick Warmbier (December 12, 1994 – June 19, 2017) was an American college student who was imprisoned in North Korea in 2016 on a charge of subversion. Subversion (through alleged attempted theft of a propaganda poster)

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