Otto Warmbier, an American college student who fell into a coma while detained by North Korea and was returned to the U.S. last week in a stunning display of diplomatic prowess, has died, his family said Monday — the latest twist in increasingly fraught ties between Washington and Pyongyang.

The 22-year-old Warmbier "has completed his journey home," the family said in a statement.

"Unfortunately, the awful, torturous mistreatment our son received at the hands of the North Koreans ensured that no other outcome was possible beyond the sad one we experienced today," the statement said.