The board was encouraged he would be joining the programme's starters group, to begin later this month.
He was expected to complete the programme by late next year and he hoped he might be eligible for entry into a self-care unit, at the undisclosed prison at which he is serving his sentence.
Carrington was not seeking a release, nor would he oppose a two-year postponement period.
The board reached a view that Carrington would not be suitable for a release in a year's time, and made a postponement order for two years.
The board advised Carrington in the days before the hearing they had met the victim's son and his wife, who "strongly oppose a release on parole".
In response to the victim's questioning on whether Carrington's motivation for entering the treatment programme was genuine, he told the board he was "genuinely motivated to undertake it in order to ensure that his risk of reoffending can be reduced".