Facts: - sport: modern pentathlon - death date: 17 may 1987 - birth date: 28 november 1933 - name: okkie van greunen - death place: pretoria , south africa - birth place: douglas , northern cape , south africa Based on these bullet points, write a short biography describing the life of okkie van greunen .
The answer to this question is:
okkie van greunen -lrb- 28 november 1933 -- 17 may 1987 -rrb- was a south african modern pentathlete .he competed at the 1956 and 1960 summer olympics .