Dag Hjalmar Agne Carl Hammarskjöld was a Swedish diplomat, economist, and author, who served as the second Secretary-General of the United Nations, from April 1953 until his death in a plane crash in September 1961. At the age of 56 years and 255 days, Hammarskjöld was the youngest to have held the post. Additionally, he is one of only four people to be awarded a posthumous Nobel Prize and was the only United Nations Secretary-General to die while in office. Wikipedia*
On the C-SPAN Networks:
Dag Hammarskjold has one video in the C-SPAN Video Library; the first appearance was a 1990 Vignette.