The shooter ordered to execute police witness Christopher Crean says he has been let down by the prison system.
Robert Shane Maru, 43, was found guilty of fatally shooting the New Plymouth man in 1996 along with three other Taranaki Black Power members.
In shooting Mr Crean, Maru was carrying out the order of New Plymouth Black Power vice-president Brownie Mane, 42.
Mr Crean was to be a witness in a forthcoming trial after he saw Black Power members attack a Mongrel Mob member in Marfell.
Mane was last month declined parole.
Maru was also eligible to apply but he signed a waiver saying he did not want release.
In his letter of explanation, he told the Parole Board he felt let down by the Corrections Department.
"He says that he is falling through the cracks," the board said in its report.
Maru said he now had a fourth case manager in his current prison - which was not revealed by the board - and was frustrated that his three co-offenders were all in external self care units.
He was not interested in release but wanted the opportunity to be rehabilitated, the board said.
"And we support that."
South Taranaki Black Power president Dennis Luke and Symon George Manihera were both declined parole last year.
- © Fairfax NZ News
What do you think of the NPDC's decision not to give iwi representation and voting rights?Related story: Dismay as iwi voting rights denied