The Registrar General's Index
If you have both the date of death and the full name (or at least the first name and surname) of the person you're researching, then searching the Registrar General's index should be easy. Unfortunately, the index isn't accessible online (you can request a search, although you'll have to pay for it), but some of the indexes can be found in larger public libraries in New Zealand. The indexes are kept alphabetically, year-by-year. Keep in mind that they go by date of registration of the death, rather than by the actual date of death. So if a person died in December, for example, the death might not have been registered until the following year.
Once you locate the entries you want, it's easy to apply for a certificate of death ($26 NZ) or a printout of the entry ($26 NZ for 1854-74, $20 NZ for 1874 onwards). You can download the request form from The Department of Internal Affairs.
Information on a Death Certificate
Prior to 1875, there wasn't a great deal of information on the death certificate - simply where and when the person died, their first name and surname, sex, age and rank or profession, along with the cause of death, a very brief description of the deceased, where he lived and the name and signature of the registrar. For genealogists this offers some basic knowledge of the person, but it's spare on the detail you really need.
After 1875, things improve for anyone tracing family history, as death certificates became very full. As well as the information above, the certificate now contained the cause of death, the duration of the last illness, the name of the doctor and when he last saw the person, as well as the name of the deceased's father and mother (including her maiden name), when and where the deceased was buried and even the name and religion of the minister or witness. However, some of the most important new facts for a genealogist are how long the deceased had been in New Zealand, where he was born, where he'd married (including to whom and at what age) and the number and sex of the children. You can find plenty there to spur on your research in several different directions.
In 1912 the death certificate was amended yet again, adding the deceased's place of residence, how long had elapsed between the start of the final illness and death, and the widow's age (if she was still alive).
Quite obviously, for genealogists, the information given from 1875 onwards is a gold mine, allowing you to rapidly further your search. The "how long in New Zealand" entry in particular can be especially important for tracing immigrants.

Determines which genealogy records are likely available for a specific ancestor based on location, date, and record type.
Try our Record Availability Checker free, here on this site →If You Lack the Date of Death
Without at least the year of death, you're going to find your search more difficult, and every avenue is going to take plenty of time and effort, but don't let that stop you. Use the knowledge you have as a starting point. For instance, you can begin searching forwards from the last year you know your subject was alive, although there's no doubt this will be a slow, painstaking (and possibly expensive) procedure.
Your situation may be slightly different. ask a question below ↓ and our editorial team will reply with our advice.
Cemetery Records
If you know, or think you know, where your subject died, cemetery records can be a good method of locating a dead ancestor. The problem of course, is that if the person died in a large city, your search could prove to be time-consuming. The International Genealogical Index has quite a number of cemetery records; whilst definitely not complete, it might contain something. Additionally, a number of New Zealand cemetery records are also available online.
Parish Registers
These can be a good source for pre-1848 deaths. However, you'll need to know where your ancestor lived before you can begin your search. If you have that information, try the churches in the district.
My birthday is December 11, 1945.
My adoptive parents have now both passed away, and I am seeking information about my background. Can anyone help?
Thank you
Two quick searches of the NZ births, deaths marriages register show the death of a Francis John Nunn in 1959 aged 73yrs. NX electoral rolls up until 1981 are now on line and can be searched. Show Francis lived in and around Wanganui ( North Island) and he appears to have been married.
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