Cameroon: 'Bishops saw traces of violence on Bala's corpse'

Catholic bishops in Cameroon have reasserted that Bishop Jean Marie Benoit Bala was 'murdered'.
This message is contained in a communiqué signed on Monday 10 July by the president of the National Episcopal Conference.
On behalf of the bishops, Samuel Kleda claims that the bishops noted traces of violence on the corpse they saw and identified at the river and mortuary as that of late Bala.
This, they say, is why they declared on June 13 that the bishop had been"brutally murdered". 
They further revealed that the authorities of the Catholic church has not yet received the corpse of the late servant of God as stated on July 4 in a press release about the report of the preliminary inquiries into the incident.
This statement contradicts recent report into the death altogether.
Investigators had said on July 4  that drowning was the most probable cause of the death. There was no trace of violence on the corpse, they had said.
What's happening?
This controversy puts two strong sides at odds.
Bishops are men of God, hence should 'tell the truth '.
Investigators are 'trained individuals whose impartiality and integrity should distinguish them from other people in society.'
So who is lying, and why?
Bishop Bala went missing at the beginning of last month. About three days later, he was found dead in a river.