David Michael Witchall, 35, is due to complete his prison term in June but the board heard that he remained at a high likelihood of reoffending, according to his Corrections’ risk-assessment score.
In 2015, Witchall was sentenced to more than nine years’ imprisonment on a variety of sex charges against young women.
He met a 16-year-old through a mutual friend and became angry when she refused a hug.
Witchall led her to a basement carpark and said she could only leave once they had sex.
He was also convicted of grooming four under-16s as part of the same trial.
Witchall bombarded his victims with messages until they agreed to meet and, when they did, he groped them.
The Rolleston Prison inmate has consistently denied responsibility for the sex crimes and has therefore been deemed unsuitable for specific treatment in that area.
In November 2023, Witchall had 19 months added to his sentence for an attack on another prisoner.
He and an associate called the victim over to a storage locker and began a barrage of blows, which rendered the man unconscious.
He was left with a fractured cheekbone and nose, as well as severe bruising around both eyes.
At a hearing at the end of last year, Witchall told the Parole Board he remained unsure what prompted such outbursts.
"He talked to the board today about one high-risk situation, which is if people around him are violent then he will join in. He was not sure about his other high-risk situations and overall, he was not sure why he is violent," panel convener Kathryn Snook said.
"He said he is still learning techniques to manage his risk of violence and does not yet have a safety plan."
Witchall acknowledged he would need help reintegrating into society after spending so much time in jail and had been accepted to a facility specialising in such scenarios.
However, there was no bed currently available there.
Aside from some sessions with a psychologist Witchall remained "essentially untreated", Ms Snook said.
He will see the board again in April.
