The ousted Fiji Prime Minister, Laisenia Qarase, has described Francis Kean's reappointment as Navy Commander as outrageous.
Mr Kean was sentenced to 18 months in jail for the death of John Whippy at the Royal Suva Yacht Club in late December 2006.
He served six months in jail and was granted a Compulsory Supervision Order to serve the remainder of his term outside of prison.
Mr Qarase told Fiji Live that the reappointment leads to questions about the interim government's ethics.
He said that to commit a serious crime and then be given a post in the civil service shows a lack of good governance.
He raised the issue of favouritism as Mr Kean is the brother in-law of the interim Prime Minister Commodore Frank Bainimarama's brother-in-law.
The Fiji Ex-Peacekeepers Association has also come out against the reappointment, calling it an insult to members of the military and the institution.
The Association secretary, Taniela Senikuta, says despite the military and the Government's claim that Mr Kean is the most qualified person for that job, there is no shortage of capable officers to fill the post .