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Otto Warmbier, the American student imprisoned in North Korea for more than fifteen months has died, just six days after he returned to the US in a coma. The 22-year-old, who was jailed for trying to steal a propaganda sign from a hotel, did not regain consciousness. North Korea says he contracted botulism soon after his trial in March 2016, but US doctors say they found no signs of the rare illness. We speak to experts about the mystery surrounding his death. Photo: Otto Warmbier attends a news conference in Pyongyang, North Korea, 2016, Credit: Reuters/Kyodo