A former Rwandan army colonel who was accused of masterminding the slaughter of 800,000 people during the 1994 genocide has died in prison in Mali, Malian officials have announced. Theoneste Bagosora was serving a 35-year sentence after being found guilty of crimes against humanity by the then International Criminal Tribunal for Rwanda (ICTR). His sentence had been reduced from life in prison. "It is confirmed. He was over 80 years old, he was seriously ill, with heart troubles. He was hospitalised several times and had three surgeries. He died today in a clinic," a source in Mali's prison administration who…