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John Joseph O'Connor, from Abbeydorney in Ireland, died while working in the Pyne Gould Corporation building.
The 40-year-old accountant, his New Zealand-born wife Sarah and the couple's two-year-old son, Dan, arrived in New Zealand around September 2010 to start a new life in Christchurch.
The couple were expecting their second child in May.
Family members in Ireland told local media the family had been due to return in July for a wedding.
