One of the lawyers who represented Teina Pora, wrongly convicted for murder, is taking on Scott Watson's application for mercy.
Jonathan Krebs says he became interested in Watson's case after reading his application for a Royal Prerogative of Mercy.
Watson is in prison for the murders of Olivia Hope and Ben Smart, who disappeared on New Year's Day, 1998.
The application, to Governor-General Dame Patsy Reddy, challenges whether two blonde hairs found on Watson's boat were Hope's.
Read more:
Sounds murder: Bodies of Olivia Hope and Ben Smart 'never dumped at sea'
Sounds double murder: Did Scott Watson kill Ben Smart and Olivia Hope?
Hope-Smart killings: Convicted murderer Scott Watson and Gerald Hope meet at prison