According to a decision released by the ICTR Chamber, the judgement will now be delivered on 22 June. No specific reason was given for the change.
The judgement second for this year ---one of the fastest in the ICTR's 15 year history-follows that of Priest Emmanuel Rukundo, who was sentenced to 25 years in prison in February.
Kalimanzira, an agronomist by training, was during the closing stages of the1994 genocide, Acting Interior Minister.
The most serious facts charged against Kalimanzira relate to the alleged role he played in the massacre of thousands of ethnic Tutsis who had sought refuge on Kabuye Hill, sub-prefecture of Gisagara, Butare, southern Rwanda, towards the end of April 1994.
Committed by soldiers, Interahamwe militiamen and Burundian Hutu refugees, the slaughter on Kabuye Hill lasted several days, according to the prosecution.
The UN Tribunal, set up to try key suspects of the 1994 genocide, has so fat convicted 38 persons and acquitted six.
Kalimanzira surrendered himself to the Tanzanian authorities in November 2005 from neighbouring Kenya, where he lived with his family.
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© Hirondelle News Agency