U.N. Secretary-General <a href="https://en.wikipedia.org/wiki/Dag_Hammarskjöld" id="mwASk" rel="mw:WikiLink" title="Dag Hammarskjöld">Dag Hammarskjöld</a> dies in an <a class="mw-redirect" href="https://en.wikipedia.org/wiki/1961_Ndola_United_Nations_DC-6_crash" id="mwASo" rel="mw:WikiLink" title="1961 Ndola United Nations DC-6 crash">air crash</a> while attempting to negotiate peace in the Katanga region of the Democratic Republic of the Congo.