Mark Lundy will attempt to appeal his convictions for murdering his wife and daughter at the Supreme Court.
On Friday, the Supreme Court confirmed to Newshub that Lundy's solicitor had filed an application to appeal his convictions.
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In October, the Court of Appeal rejected a legal bid by Lundy, saying his appeal should be dismissed on the basis no substantial miscarriage of justice had occurred.
He has twice been convicted of killing his wife, Christine, and daughter, Amber, in Palmerston North in 2000.
The first conviction came in 2002, before the Privy Council overturned his conviction in 2013. He was found guilty again in a retrial in 2015.
Stains on Lundy's shirt have been the point of contention in his trials and appeals. While the Crown says they could be brain or spinal cord matter from his wife, the defence argues it could be food.
Lundy's lawyers also argued there were significant omissions from the Judge's summing up at the first trial, while the retrial was abuse of process because of substantial changes to the Crown case compared to the first trial.
But the Court of Appeal were satisfied the trial had been fair.
Lundy is serving life imprisonment, with a minimum term of 20 years.