David Roberts was murdered when he refused to let his attacker into a woman's flat in the apartment block where he worked as a manager.
He was found with an Indonesian man who had also been murdered after an armed siege, lasting three hours, end
ed with the arrest of the knifeman.
A spokesman for the New Zealand police said an Iraqi man had been charged with the double killing and aggravated burglary.
It is believed that Mr Robert's brave stand could have saved the life of the female tenant and he died a hero.
His shocked family wept as the devastating news was told to them by local authorities at their home in Maesincla, Caernarfon.
Mr Roberts' niece, Tanya Lewis, told the BBC: "I can't believe somebody would do something like this to him. You don't think it's ever going to happen to you. It's devastating."
His brother-in-law, Ronald Morgan, said: "If it was an accident probably we might have been able to come to terms with it a lot easier.
But to find out it was a murder, that was the worst thing that could happen to anybody and especially involved with a knife.
"You hear so many things in the country about people being killed with knives and things like that and you never think about it happening to your own family."
David Roberts was one of three children and a former pupil at Ysgol Maesincla and Ysgol Syr Hugh Owen, Caernarfon.
He studied engineering at Coleg Menai and gained degrees at Manchester Polytechnic and London University.
He had worked all over the world as a computer chip designer for firms such as ICI and Fujitsu in Silicon Valley, California, Germany and China.
He also worked for a charity in Lesotho, Africa, and was described as a 'lovely man who wouldn't hurt a fly' and 'one in a million'.
Baseem Ridha Kadhim Abbad Almery, 30, has appeared before Auckland District Court on Monday and was remanded in custody. He will appear before the court again on August 18.
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