Just a mod note to remind potential respondents that this sub is not a place for speculation/conjecture.

OP, you may be interested (if you aren't already aware) that the UN recently opened an inquiry into the death of Hammarskjold; the findings have not yet been announced.

http://www.un.org/apps/news/story.asp?NewsID=50337#.VQmU8o6sVW8