premise: BUJUMBURA, Apr 9 (Reuters) - An anti-corruption activist was murdered in a knife attack in Burundi on Thursday, police in the central African nation said on Thursday. Ernest Manirumva, who suffered stab wounds to the head, was the deputy chairman of a Burundi corruption watchdog known as OLUCOME. His body was found on Thursday morning inside his house in the capital Bujumbura, witnesses told Reuters. 'Manirumva was assassinated after midnight,' said a police spokesman. 'We don't yet know the people who committed the crime but investigations have started.'
hypothesis: Ernest Manirumva was an anti-corruption campaigner.