The Crown admits perjured evidence should not have been heard at David Tamihere's 1990 trial

Tamihere was found guilty of murdering two Swedish tourists -- convictions he's now fighting.

The Court of Appeal will come back with a decision next year.

The Crown says evidence of a now perjured jailhouse confession shouldn't have been used -- but, this doesn't mean his convictions should be quashed.

Open Justice reporter Ethan Griffiths says the Crown's Rebecca Thomson argues that confession was not seen as a fundamental part of the case against him.