On this day, September 18, in 1961, United Nations Secretary-General Dag Hammarskjold died in a plane crashed. Hammarskjold was the youngest person to ever have held the Secretary-General post, and is one of one of only four people to be awarded a posthumous Nobel Prize.

United States President John F. Kennedy called Hammarskjold “the greatest statesman of our century.” He was photographed by Karsh during his tenure, in May, 1956.