Trounson (44) beat 17-year-old Russell Warren Neil to death with part of a wooden balustrade in 1990 in Dunedin. He was a 19-year-old polytechnic student at the time he was sentenced in 1991 to life imprisonment.
He has since been released and recalled to prison six times, first in 2001 and most recently in November 2013 after spending months on the run from police.
Trounson appeared before the parole board on August 23.
He initially waived his appearance before the board in June, but on August 23, ''he changed his mind'', the board's decision said.
''Mr Trounson was realistic,'' the board said.
''He did not seek parole. He acknowledged that there had been a decline in his behaviour and attitude in recent months. This was reflected in the number of incident reports, at least two of which resulted in misconduct charges, incurred in May. We also noted that during this time he was exited from the MIRP Maintenance Programme for non-attendance, dismissed from his employment and was no longer having individual psychological counselling work ... Nor was he on medication.''
He attributed those issues to a medical condition he had suffered from for five years or longer. The condition caused sleeping issues resulting in him becoming irritable and having ''a pessimistic outlook on life''.
After acknowledging the problems, he felt much better, the decision said.
''He says that he is focused on getting out of the prison and remaining out,'' the board said.
''He said that he would do anything to get out and asked the board for direction as to how best to do so.
''Naturally, given his poor record on release, the board is, and always will, be very cautious when considering the way forward for Mr Trounson.
''Nor do we, as a matter of practice and policy, set markers which an offender needs to reach in order to be granted parole.''
Trounson would need a ''strong release plan'' if he was to be paroled again and some form of residential support and community reintegration programme would be the best way forward if release was considered.
''The challenge for Mr Trounson will be to maintain good and stable behaviour in custody over an extended period and to formulate a robust release and relapse prevention plan,'' the board said.
''He will be seen again during the week beginning September 4, 2017.
''A psychological report is required for that hearing, focusing particularly on his current risk and the strength of his release plan. It would also be helpful to receive a report on his medical condition.''
