30 December 1875
Adam Kok III, founder and chief of Griqualand East, was killed in an accident when he fell from his buggy. The Cape Colonial government unilaterally annexed Griqualand East in 1874 as result of disturbances in that region; they relieved Kok of his duties as chief and granted him an annual pension. The accident happened a year after he had been deposed. There is some controversy about the exact date of his death, as another source gives the date as 31 December 1875. He is revered by the Griqua people of the present day as the greatest of the Kok chiefs.
References

Answers.com, Adam Kok III:, from answers.com, [online], Available at www.answers.com [Accessed: 02 December 2013]|Potgieter, D.J. et al. (eds)(1970). Standard Encyclopaedia of Southern Africa, Cape Town: NASOU, v. 6, p. 430.|Kruger, D.W. (ed)(1972). Dictionary of South African Biography, Cape Town: Human Sciences Research Council, v. 4, p. 287.