Warmbier fell into a coma in North Korea and was released in June 2017, after nearly 18 months in North Korea. According to North Korean authorities, Warmbier's coma was a result of botulism and a sleeping pill, but U.S. physicians cast doubt on that claim. Warmbier arrived in Cincinnati on June 13 and was taken to University of Cincinnati Medical Center for immediate evaluation and treatment. He was diagnosed with "severe neurological injury." 