[1] Ethnically, he was Ganwa of the Batare clan, and was a son of Pierre Baranyanka,[2] a paramount chief with close relations to the Belgian colonial administration in Ruanda-Urundi.
In 1954 he was made a member of the Supreme Land Council (Conseil Supérieur du Pays, CSP),[1] an advisory body presided over by the Mwami with some responsibility over budgetary and administrative affairs.
[9] Despite ideological differences, the rivalries between the two parties were primarily fueled by the intra-nobility conflicts, as the Bezi and Batare lineages backed UPRONA and PDC respectively.
[11] The Belgian administration channeled financial aid to Ntidendereza and the PDC, particularly on the initiative of Assistant Resident Pierre DeFay.
With approximately 80% voter turnout, UPRONA won 58 of 64 seats in the Legislative Assembly, and Rwagasore was declared prime minister designate.
The group quickly admitted responsibility for the murder and incriminated three other persons in their plot: Michel Iatrou, Ntidendereza, and Biroli.
On 27 November the lower court found Ntidendereza, Biroli, Nahimana, Iatrou, and Ntakiyica guilty and sentenced them to death.
[19] The defendants' final appeal to the Supreme Court was denied, as were the attempts of the Belgian government to convince the Mwami to offer clemency, and on 15 January 1963 all five were publicly hanged in Gitega stadium before thousands of people.