[1] Kapuuo was related to Samuel Maherero and was also the blood nephew of the first Namibian nationalist leader, Hosea Kutako.
Following the decision of the International Court of Justice at the Hague in 1971 that South African rule in Namibia was illegal, Kapuuo, as the leader of NUDO was instrumental in forming the National Convention.
Kapuuo objected on the grounds that the Ovambo (who made up the majority of members of SWAPO) had not been dispossessed of their land under German and South African rule as the Hereros had, and were therefore relatively privileged newcomers to the country's independence movement.
Kapuuo was assassinated by two gunmen in the black township of Katutura on 27 March 1978,[5] with both SWAPO and the South African authorities blaming each other.
[8] In 1999, Herero Paramount Chief Kuaima Riruako urged the Truth and Reconciliation Commission of South Africa to investigate Kapuuo's death as they had done with killed SWAPO activist Anton Lubowski.