The Director of Public Prosecutions (DPP) is weighing up whether to indict a man for two murders in 1991 in far north Queensland, in light of a Supreme Court ruling related to the case.

Earlier this year, a third coronial inquest into the 1991 deaths of Vicki Arnold and Julie-Anne Leahy overturned previous findings of murder-suicide.

The state coroner committed Alan Leahy to stand trial for the murder of his wife and her friend on the Atherton Tablelands.

Mr Leahy maintains his innocence and challenged that finding, and yesterday the Supreme Court agreed that coroner Michael Barnes erred in law in his committal decision.

The office of the DPP had yet to decide whether to pursue the case and until yesterday's ruling had until next month to make a decision.

The DPP can still indict Mr Leahy for murder but no longer faces a deadline by which to do so.

The DPP says it is now considering the latest judgment.

Mr Leahy's lawyers will return to court next week in a bid to have some of his legal costs reimbursed.