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Tom Byabagamba, former Chief of the Rwandan Presidential guard (R) listens to one of his lawyers (L) before his hearing at the military court in Kigali on August 29, 2014. [AFP]Caption

Former Rwandan colonel Tom Byabagamba, once a close associate of President Paul Kagame and head of the presidential guard, has died in prison having been found guilty of inciting rebellion, relatives said on Tuesday.

Long a key figure in the security apparatus around Kagame, Byabagamba was arrested in 2014 and sentenced in 2016 to 21 years in prison for "incitement to insurrection" and activities aimed at "tarnishing the image of the country or the government".

His sentence was later reduced to 15 years on appeal.