15 June 1981
David Maphgumzana Sibeko began his political career as a journalist for the South African magazine Drum. Sibeko joined the Pan Africanist Congress (PAC) during the state of emergency after the banning of the organization in 1960. He soon became a leading figure within the organisation, and by 1975 he was a member of the PAC's central committee and appointed director of foreign affairs. He was responsible for the establishment of new PAC offices in various countries, and was the PAC's permanent observer at the United Nations. Sibeko was closely involved with the removal of P.K. Leballo from the PAC leadership in 1979. He was a member of the triumvirate, known as the President's Council, which shared the chairpersonship of the organization after the palace revolution. Mutual distrust was however rife within the PAC, and Sibeko fell victim to this distrust when he was ambushed and shot dead by assassins from his own organisation on 12 June 1979 . He was shot at his flat in Oyster Bay, Dar-Es-Salaam, Tanzania. Almost exactly two years later, 6 PAC members were sentenced to 15 years imprisonment by the Tanzanian High Court for Sibeko's murder.   
References

Kalley, J.A.; Schoeman, E. & Andor, L.E. (eds) (1999) Southern African Political History: a chronology of key political events from independence to mid-1997. Westport: Greenwood.| T. Lodge (1983), Black politics in South Africa since 1945. Jo­hannesburg.| Verwey, E.J. (ed) (1995). New Dictionary of South African Biography, v.1, Pretoria: HSRC.