About Dag Hammarskjold:
Dag Hjalmar Agne Carl Hammarskjöld is the youngest to have held the post. He is one of only three people to be awarded a posthumous Nobel Prize. Hammarskjöld is the only UN Secretary-General to die in office; his death occurred en route to cease-fire negotiations. US President John F. Kennedy called Hammarskjöld "the greatest statesman of our century".