Five years of work come to a head next week for the team seeking to have Teina Pora's convictions for a 1993 rape and murder quashed by the Privy Council.
Pora, who was released on life parole this year after spending 21 years in jail for the rape and murder of Susan Burdett, will follow the London proceedings via the internet from Auckland.
A panel of four Law Lords and New Zealand's chief justice, Dame Sian Elias, will review the case on Tuesday and Wednesday.
Pora has twice been convicted of the crimes and had an appeal to the Court of Appeal dismissed.
His defence will contend that new evidence supports the claim that Pora's confessions were false.