Wellington Rugby chief executive Steve Rogers after the union reached an agreement with Losi Filipo to terminate his playing contract.

Losi Filipo will not be paid any of his remaining contract by the Wellington Lions as part of a mutual agreement to terminate it with 12 months remaining.

Filipo on Tuesday evening withdrew himself from the Wellington Lions 2016 Mitre 10 Cup squad at the end of a day of increasing pressure on the union from the public and from the victims of the assault.

The solicitor-general confirmed her office would investigate the circumstances behind Filipo being let off assault charges.

GETTY IMAGES Bazley also wrote a report criticising Wellington Rugby's handling of Losi Filipo, a Lions player, who returned to the game after an initial discharge without conviction for assault.

In a press release the 18-year-old said he always recognised that his actions caused hurt and complications for the victims of the assault, and hoped the termination of his playing contract would go some way towards demonstrating his remorse.

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MAARTEN HOLL/FAIRFAX NZ Assault victim Greg Morgan is unhappy with the process that saw Losi Filipo discharged without conviction.

Filipo said in a statement he was remorseful for his actions and the effects they had on his four victims.

"I understand why the victims of the assault do not want to talk to me and have not taken up an offer of restorative justice, but I would like to publicly apologise for my actions and the damage they caused.

"I made a huge mistake that my victims and myself will have to live with for the rest of our lives.

RNZ Rugby Players' Association chief executive Rob Nichol says Losi Filipo needs to take the opportunity to turn his life around.

"I will continue to access the personal development and support structures I have engaged with over the past year. Though I cannot change what happened I recognise that I have been provided with a second chance and I want to continue use this opportunity to work hard."

In August, the rising young star was discharged without conviction on four charges after an early morning assault on a group of four people, including two women last October.

Sentencing notes from Judge Bruce Davidson show he believed it was a "fairly serious case of street violence" but the consequences of a conviction would be "out of all proportion to the gravity of the offence", the sentencing judge said.

Lawrence Smith / Stuff.co.nz Prime Minister John Key responds to questions about the sentencing of rugby player Losi Filipo.

With support from his representative and the New Zealand Rugby Players' Association Filipo approached Wellington Rugby this afternoon.

He sought a release from his playing contract and, after discussions, the parties agreed termination of his contract was the best outcome, the release said.

Wellington Rugby chief executive Steve Rogers told reporters on Tuesday evening the organisation "was not aware" of a lot of the information regarding Filipo's case that had come to light over the past 24 hours.

"We knew that there had been an incident and we knew that that incident had occurred in October last year. We were not privy to the details of that. The only information we were asked to provide was 'what could happen if a player got a conviction for assault.' So we gave a generic response to that."

Rogers told reporters Filipo did not have the remainder of his two-year contract - which was due to finish at the end of this year - paid out.

The decision to terminate Filipo's contract "by mutual agreement" this evening does not prevent him from playing rugby. He will be allowed to play at a club level in Wellington should he wish to.

Rogers said Wellington Rugby was "most of the time, not aware when those hearings were".

"Just like any other person, Losi is free to go and join a rugby club and play the game of rugby ... he can play globally if he wants to," Rodgers said.

The situation was unfortunate, Rodgers said.

"Our first thoughts are with the victims of this assault. Wellington Rugby would like to extend our sympathies to the two men and women involved in the incident and reiterate the fact that we do not condone violence in any form.

"We would like to extend an offer of assistance and support to Greg Morgan, a member of our rugby community who we have learned will not be able to play the game due to his injuries."

Rogers said Wellington Rugby was not simply washing its hands of Filipo due to public pressure and would continue to offer support.

"Wellington Rugby believes the best outcome for society would be for Losi to remain involved in the game of rugby. To that end we put support structures in place which we believe have already helped him make big advancements."

Rodgers said the organisation was still deciding what its next step should be.

"We've trusted the judicial system in regards to the outcome and the thing about that is how sport can play such an important part in peoples' lives, especially around rehabilitation.

"We were really struggling with, we've got that responsibility, but all these other facts seem to have come out."