The inquiry into David Harold Eastman's murder conviction has formally ended, with the board lodging its findings with the ACT Supreme Court on Thursday.
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The report will now go before the full court for consideration. It will decide whether to confirm or quash the conviction.
Even if the court decides to confirm the conviction, it could choose to pardon Eastman and release him from custody.
An order to overturn the guilty verdict could result in a retrial. It could also effectively reaffirm the conviction.
Acting Justice Brian Martin delivered his findings in the inquiry to the registrar of the Supreme Court on Thursday.
Court officials confirmed they had received the report, but would not disclose its contents.
"The report and documents accompanying the report are now in the custody and control of the Supreme Court," the court said.
"No comment will be made about the contents of the report."
The delivery of the report concludes the function of the board.
Eastman has spent almost 19 years behind bars for the assassination of assistant Australian Federal Police commissioner Colin Winchester, who was killed in Deakin in January 1989.
He was convicted by a jury in 1995 of the murder, on a circumstantial case that included claims gunshot residue from the murder scene matched samples found in Eastman's car.
But he has always maintained his innocence, unleashing waves of litigation in a bid to clear his name.
In 2012, judge Shane Marshall ordered an inquiry into the conviction after he found there had been "fresh doubt or question" raised about Eastman's conviction.
Justice Marshall ordered the inquiry to investigate 19 wide-ranging grounds, including the conduct of the prosecution and investigating police.
The inquiry – which could cost the taxpayer roughly $4 million – received evidence from its final witness in April and closing submissions were heard mid-May, finishing five months of public hearings.
During that time, the inquiry heard of problems with the conviction, including forensics, police harassment, Eastman's mental fitness to stand trial and if the trial judge had been tainted by apprehended bias.
It is unknown when the report or the court's decision will be made public.
The delivering of the report comes a week after the full bench of the ACT Supreme Court threw out an attempt by the Director of Public Prosecutions to halt the inquiry.
The DPP had applied for judicial review of two decisions that had helped create and shape the inquiry.
The DPP took exception to an order creating the inquiry, made in September 2012, and a second decision by Acting Justice Martin not to limit its scope.
The challenge came before the full court about 14 months after the 2012 decision and months after the inquiry had heard evidence that raised "serious issues" with Eastman's conviction.
The court, led by Chief Justice Helen Murrell, used its discretion to dismiss the DPP's challenge last week, despite finding errors with the decisions.
