Police have confirmed they found a note at a house in the Manawatu town of Feilding where three people were found dead on Monday.
The bodies of Desmond Vincent Winnie, 65, his wife Deborah Honeyfield, 51, and her 86-year-old father Ian Ray Honeyfield were found at the Lees Road property on Monday.
Police are not seeking anyone in connection with the deaths.
They say post-mortems will be carried over the next two days and the results will probably be released on Friday.