Otto Warmbier

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The casket of Otto Warmbier is carried from Wyoming High School after his funeral, Thursday, June 22, 2017, in Wyoming, Ohio. Warmbier, a 22-year-old University of Virginia undergraduate student who was sentenced in March 2016 to 15 years in prison with hard labor in North Korea, died this week, days after returning to the United States. (AP Photo/Bryan Woolston)

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The casket of Otto Warmbier is carried from Wyoming High School after his funeral, Thursday, June 22, 2017, in Wyoming, Ohio. Warmbier, a 22-year-old University of Virginia undergraduate student who was sentenced in March 2016 to 15 years in prison with hard labor in North Korea, died this week, days after returning to the United States. (AP Photo/Bryan Woolston)

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American student Otto Warmbier died in Ohio just a few days after being released from North Korea in a coma. He was held in North Korea for more than 17 months. (Associated Press)

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In this Feb. 29, 2016, photo, American student Otto Warmbier cries while speaking to reporters in Pyongyang, North Korea. The family of Warmbier who died days after being released from North Korea in a coma says the 22-year-old "has completed his journey home." Warmbier died Monday, June 19, 2017, relatives said in a statement. He arrived in Ohio on June 13, 2017, after being held for more than 17 months. (Korean Central News Agency/Korea News Service via AP)

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In this Feb. 29, 2016, photo, American student Otto Warmbier cries while speaking to reporters in Pyongyang, North Korea. The family of Warmbier who died days after being released from North Korea in a coma says the 22-year-old "has completed his journey home." Warmbier died Monday, June 19, 2017, relatives said in a statement. He arrived in Ohio on June 13, 2017, after being held for more than 17 months. (Korean Central News Agency/Korea News Service via AP)

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In this Feb. 29, 2016, file photo, American student Otto Warmbier cries while speaking to reporters in Pyongyang, North Korea. Warmbier died Monday, June 19, 2017, relatives said in a statement. He arrived in Ohio on June 13, 2017, after being held for more than 17 months. (Korean Central News Agency/Korea News Service via AP)

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FILE- In this June 13, 2017, file photo, a crying woman exits a transport plane carrying Otto Warmbier, a 22-year-old University of Virginia undergraduate student who was imprisoned in North Korea in March 2016, as he is transferred from his transport aircraft to an ambulance at Lunken regional airport in Cincinnati. Warmbier, an American college student who was released by North Korea in a coma last week after almost a year and a half in captivity, died Monday, June 19, his family said. (AP Photo/John Minchillo, File)

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A pair hugs and cries outside the plane carrying Otto Warmbier, a 22-year-old University of Virginia undergraduate student who was imprisoned in North Korea in March 2016, before he is transferred from a transport aircraft to an ambulance at Lunken regional airport, Tuesday, June 13, 2017, in Cincinnati. Warmbier, serving a 15-year prison term for alleged anti-state acts, was released and medically evacuated from the reclusive country Tuesday and has been in a coma for months, his parents said. (AP Photo/John Minchillo)

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Visitors and medical personnel enter a transport plane carrying Otto Warmbier, a 22-year-old University of Virginia undergraduate student who was imprisoned in North Korea in March 2016, before he is transferred to an ambulance at Lunken regional airport, Tuesday, June 13, 2017, in Cincinnati. Warmbier, serving a 15-year prison term for alleged anti-state acts, was released and medically evacuated from the reclusive country Tuesday and has been in a coma for months, his parents said. (AP Photo/John Minchillo)

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Family members return to their vehicles after Otto Warmbier, a 22-year-old University of Virginia undergraduate, who was detained and imprisoned in North Korea, is loaded into an ambulance at Lunken Airport in Cincinnati, Tuesday, June 13, 2017. Warmbier whose parents say he has been in a coma while serving a 15-year prison term in North Korea was released and returned to the United States Tuesday, as the Trump administration revealed a rare exchange with the reclusive country. (Sam Greene/The Cincinnati Enquirer via AP)

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Medical personnel and visitors gather at the nose of a transport plane carrying Otto Warmbier, a 22-year-old University of Virginia undergraduate student who was imprisoned in North Korea in March 2016, before he is transferred to an ambulance at Lunken regional airport, Tuesday, June 13, 2017, in Cincinnati. Warmbier, serving a 15-year prison term for alleged anti-state acts, was released and medically evacuated from the reclusive country Tuesday and has been in a coma for months, his parents said. (AP Photo/John Minchillo)

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A crying woman exits a transport plane carrying Otto Warmbier, a 22-year-old University of Virginia undergraduate student who was imprisoned in North Korea in March 2016, as he is transferred from his transport aircraft to an ambulance at Lunken regional airport, Tuesday, June 13, 2017, in Cincinnati. Warmbier, serving a 15-year prison term for alleged anti-state acts, was released and medically evacuated from the reclusive country Tuesday and has been in a coma for months, his parents said. (AP Photo/John Minchillo)

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Medical personnel and visitors gather at the nose of a transport plane carrying Otto Warmbier, a 22-year-old University of Virginia undergraduate student who was imprisoned in North Korea in March 2016, before he is transferred to an ambulance at Lunken regional airport, Tuesday, June 13, 2017, in Cincinnati. Warmbier, serving a 15-year prison term for alleged anti-state acts, was released and medically evacuated from the reclusive country Tuesday and has been in a coma for months, his parents said. (AP Photo/John Minchillo)

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Otto Warmbier, a 22-year-old college student detained and imprisoned in North Korea, is carried off of an airplane at Lunken Airport in Cincinnati on Tuesday, June 13, 2017. Warmbier arrived in Ohio after being released by North Korea, where he was serving a 15-year prison term with hard labor for alleged anti-state acts. His parents have said he has been in a coma and was medically evacuated. (Sam Greene/The Cincinnati Enquirer via AP)

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The legs of Otto Warmbier, a 22-year-old University of Virginia undergraduate student who was imprisoned in North Korea in March 2016, are seen as medical personnel transfer him from a transport aircraft to an ambulance at Lunken regional airport, Tuesday, June 13, 2017, in Cincinnati. Warmbier, serving a 15-year prison term for alleged anti-state acts, was released and medically evacuated from the reclusive country Tuesday and has been in a coma for months, his parents said. (AP Photo/John Minchillo)

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Two people hug outside the plane carrying Otto Warmbier, a 22-year-old University of Virginia undergraduate student who was imprisoned in North Korea in March 2016, before he is transferred from a transport aircraft to an ambulance at Lunken regional airport, Tuesday, June 13, 2017, in Cincinnati. Warmbier, serving a 15-year prison term for alleged anti-state acts, was released and medically evacuated from the reclusive country Tuesday and has been in a coma for months, his parents said. (AP Photo/John Minchillo)

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FILE – In this Feb. 29, 2016, file photo, American student Otto Warmbier speaks as Warmbier is presented to reporters in Pyongyang, North Korea. North Korea announced Warmbier's detention Jan. 22, 2016, and the University of Virginia student from suburban Cincinnati was sentenced in March 2016 to 15 years in prison at hard labor after a televised confession that he tried to steal a propaganda banner. As President Donald Trump's administration takes office one year later, there's been little public word about what has happened to Warmbier. (AP Photo/Kim Kwang Hyon, File)

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Otto Warmbier, a 21-year-old University of Virginia undergraduate student, was convicted and sentenced in a one-hour trial Wednesday morning at the North's Supreme Court. He was charged with subversion. (Associated Press)