Lakshmi Sammarco, a coroner in Warmbier’s home state of Ohio, said the 22-year-old, who had been sentenced to 15 years’ hard labour while visiting North Korea, had died from a lack of oxygen and blood to the brain but could not explain what caused his neurological condition.
“We don’t know what happened to him, and this is the bottom line,” Sammarco said, adding that the cause of the death may never be known.