Who is Otto Warmbier, the college student held prisoner in North Korea

After serving a year of a 15-year prison sentence for stealing a poster from a hotel in North Korea, American detainee Otto Warmbier was released and returned to his family in the US.

Warmbier has reportedly been in a coma for a year and has been in a state of "unresponsive wakefulness," his doctors said.

For the time being, it is unclear what truly happened during the year Warmbier spent in North Korea - despite North Korea's account that Warmbier contracted botulism and went into a coma after taking a pill to help him sleep.

Here is what we know about the 22-year-old who spent more than a year imprisoned in North Korea: