Death of Dag Hammarskjold
UN Secretary-General Dag Hammarskjöld died in a plane crash in 1961 while traveling to negotiate a cease-fire in the Congo. Later UN inquiries found that outside interference remained plausible.
Hammarskjöld was traveling to Ndola, in what is now Zambia, for talks with the leader of the breakaway province of Katanga. The aircraft crashed near Ndola during the night of September 17–18, 1961. All 16 people aboard died.
The Rhodesian inquiry attributed the crash to pilot error. An early UN commission could not determine the cause. Witness accounts about the flight and the possibility that other governments held relevant records kept the inquiry open. Historian Susan Williams brought renewed attention to the case with her 2011 book Who Killed Hammarskjöld?
In November 2026 the UN announced that it had received a further report from Mohamed Chande Othman, the former chief justice of Tanzania. He still regarded an external attack or threat as plausible and identified sabotage and unintentional human error as other feasible explanations. The report gave no definitive cause.
Another entry in this category is Death of Karen Silkwood.
Bibliography:
- Williams, S. (2011). Who Killed Hammarskjöld? The UN, the Cold War and White Supremacy in Africa. Hurst.
- United Nations. (2026, November 4). Daily press briefing by the Office of the Spokesperson for the Secretary-General. Update on the Hammarskjöld investigation.