The federal government is blocking Yukon's coroner from holding a scheduled inquest into the 2010 drowning death of RCMP Constable Michael Potvin.
Potvin died in the Stewart River near Mayo, Yukon after the RCMP boat he was in capsized.
The RCMP have never released details about why the boat overturned.
Chief Coroner Sharon Hanley says she's postponed an inquest planned for May 14, because of federal objections.
"It surrounds that kind of thing, that maybe the coroner does not have the jurisdiction to investigate federal matters."
Hanley says federal lawyers will make an application before a coroner on May 17 laying out the government's objections.
Neither she nor the federal justice department will say what the issues are.