A man who punched his ex-partner's new boyfriend to death has been told he will never be forgiven for the hurt and suffering he has caused.
Matthew Edmonds was acquitted of murder but found guilty of the manslaughter of Peter Bettink at a trial in the High Court in Auckland last month.
Edmonds was jailed for six years and four months when he appeared for sentencing at the court today.
The court was told Mr Bettink stepped in after Edmonds assaulted ex-partner Anneta Knott and Edmonds then turned on him.
Mr Bettink's father-in-law Brian Cottrell told Edmonds he was the only one who knew how much force he had used in the brutal attack.
"May you live in hell and then die. He will never be forgiven for the grief and suffering he has caused our family."
Mr Cottrell said the lives of the entire Bettink family changed after Edmonds' attack.
The court was told Edmonds had been in a relationship with Ms Knott before moving to Whanganui - but continued to send her money.
When he visited, months later, Edmonds found Mr Bettink at the home of Ms Knott and lashed out at her.
Justice Venning said Edmonds pushed Ms Knott to the ground and dislocated her jaw before turning on Mr Bettink.
"Your attack knocked him to the ground, you continued punching him to the face and head while he was on the ground. The blood splatter from the punches were spread over a number of objects around the scene."
In sentencing, Justice Venning took time off Edmonds' sentence for his remorse and his early admission of responsibility.