Hutus butchered 800,000 minority Tutsis and politically moderate Hutus during 100 days of slaughter in Rwanda fifteen years ago.
Kalimanzira's sentencing raises the number of ICTR's judgements delivered to 38, six of which were acquittals.
The court had until the end of last year to complete all trials, and until 2010 to hear all appeals before winding up.
However, cases have spilt over and the ICTR says it is working hard to finish hearing evidence in all trials by the end of 2009.
There are still recriminations over the international community's inability to prevent or stop the genocide, and over who exactly was to blame.