Matthew Bryce Larson (25) has been granted parole after July 29, following a hearing of the New Zealand Parole Board at an undisclosed prison this month.
Larson was sentenced to three years in prison on a charge of manslaughter, following the death of Steve Radnoty (51) on March 12, 2011.
The Christchurch man, who had been celebrating the birth of his son hours earlier, walked into the central Dunedin McDonald's outlet and, soon after, felled Mr Radnoty with a single punch.
Mr Radnoty fell, hitting his head on the tiled floor. He never regained consciousness and later died in Dunedin Hospital, surrounded by family members.
His partner, Carol Radnoty, died last month.
Mr Radnoty's sister, Debbie Radnoty, said although it was expected Larson would be released from prison after serving a couple of years, she noted: ''It is not much [time] is it?''
''It was on the cards this was going to happen. We all got used to that idea, but I don't think anyone should only be given that much time.''
The Parole Board noted Larson had completed the special treatment unit rehabilitation programme, (Sturp), which provides treatment to serious violent offenders with a high risk of re-offending.
He had a full-time job offer available following his release, and had been sitting his licences so he could be employed by the company.
The board raised concerns about Larson returning to using and abusing alcohol, and it was a condition that his residence be alcohol-free.
The board also noted Larson was under intensive supervision for offending relating to drink-driving and on a third and subsequent offence.
He had ''previously demonstrated an inability to comply'' with electronic monitoring, and also had breached community detention and court orders.
The board expected Larson, having done the Sturp programme and Drug Treatment Unite programme, would have the skills to deal with risk areas, and comply with his release conditions.
Larson would be on partial restrictions at his address - from 8pm to 6am - for four months following his release.
This order would be reviewed by the board in December.
He was not to possess, buy or consume alcohol while subject to parole conditions.
