The family of a missing French Polynesian journalist is lodging a formal complaint for murder .
Jean-Pascal Couraud went missing seven years ago, but allegations surfaced two months ago that he was abducted and killed by members of the GIP force responsible to President Gaston Flosse.
A former spy of the unit, Vetea Guilloux alleged that fellow agents drowned the journalist and sank his body off Tahiti.
Guilloux was jailed for criminal slander in October but was freed last month pending an appeal.
The prosecution has refused to re-open the old case, which has prompted the Couraud family to lay a fresh complaint so that a new case has to be opened.
President Flosse has said he has never ordered or wished anybody's death.