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Otto Warmbier, the American student detained in North Korea for more than 15 months, has died. He was returned to his family last week but US doctors reported that he had suffered severe neurological injury. Danny Gratton shared a room with Otto Warmbier on the trip to North Korea and remembers the day he was arrested. (Photo: Otto Warmbier (C) being taken to North Korea's top court in Pyongyang, North Korea Credit: Getty Images)