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Convicted double killer John Barlow's application for leave to have his case heard by the Privy Council will be held in London later this month.
Barlow's lawyer, Greg King, told NZPA today the application would be heard on July 22.
Barlow was found guilty at his third trial of the 1994 shootings of businessman Eugene Thomas and his son Gene in their central Wellington office. Jurors failed to reach verdicts in the first two trials.
He was jailed for a minimum of 14 years and is due to be considered for parole for the first time in October this year.
Mr King said earlier this year that the focus was still on clearing Barlow's name.
"John Barlow wants to leave prison an innocent man, not a paroled murderer," Mr King said.
Barlow was denied a pardon in his first appeal in the Court of Appeal in October, 2006. In March this year, he was denied a second appeal, despite forensic evidence used to convict him being called into doubt.
Governor-General Anand Satyanand, on advice from Justice Ministry and Justice Minister Annette King, refused Barlow's request to have his case heard a second time.
At Barlow's third trial, the prosecution called a United States Federal Bureau of Investigation (FBI) ballistics expert who provided forensic evidence using lead content tests to match crime scene bullets with those in a box belonging to Barlow.
The FBI has since stopped its bullet-testing practice after scientific criticism it might produce a high rate of false matches of bullets.
It contacted law enforcement agencies worldwide, informing them of its decision.
In 166 years, only 10 New Zealand criminal cases have been granted full Privy Council hearings.
Of those six were dismissed, three were allowed and one was withdrawn by the appellant, Ministry of Justice statistics show.
In May last year, the Privy Council allowed convicted killer David Bain's appeal, saying there has been a substantial miscarriage of justice.
Bain will be retried next year for the murder of his parents, two sisters and a brother
- NZPA
