I haven't been on this thread since seeing the news that Otto had died. I've just been too sad. But decided to see what people's thoughts are here.
Michmi, I also had the thought they maybe the NK were conducting experiments on Otto. But, I don't think the would have the technology to conduct elaborate experiments. The pronounced loss of brain tissue without evidence of external trauma is puzzling.
Could the loss of brain tissue be caused by prions, whether introduced into Otto's body intentionally (via injection) or unintentionally (e.g., via ingestion of infected food)? Some info on prion diseases such as CJD:
http://neuropathology-web.org/chapter5/chapter5ePrions.html
Prion diseases are progressive and death occurs within a matter of months to 1-2 years, so the timing would be right. NK could have realized Otto's condition had advanced to the point that he would not survive much longer, which is why they decided to release him. MOO
We will likely not find out if that is the cause of Otto's death since no autopsy was performed. Or, maybe US doctors already made a diagnosis before Otto died.
I think his family just want him to be at peace after all he suffered at the hands of the NK regime for more than a year.