Cold Case Hammarskjöld is a documentary film by Danish film maker Mads Brügger about the death of UN General Secretary Dag Hammarskjöld, whose airplane crashed in Northern Rhodesia (now Zambia) in 1961. According to the film, Hammarskjöld's plane was shot down by Belgian-British mercenary pilot Jan van Risseghem. Up to 2019, no culprit was known, and van Risseghem had referred to his plane’s log book, which indicated that he was not in Katanga at the time. However, pilot Roger Bracco told the filmmakers that the log was falsified. Another person who knew van Risseghem, Pierre Coppens, told the filmmakers that in 1965 van Risseghem had told him that he was the one who shot down the plane. Van Risseghem had told him how he had solved the technical challenges in downing the plane. According to Coppens, van Risseghem did not know who was on board the plane when he shot it down.