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The Wills Act 2010 says

19Effect on will of will-maker's marriage or civil union ending

• (1)This section applies when—

  • (a)a will-maker makes a will; and

  • (b)after the will-maker makes the will, an order of a kind described in subsection (2) is made to which the will-maker is a party; and

  • (c)the order is in force when the will-maker dies; and

  • (d)the will contains a provision of a kind described in subsection (3).

  (2)The orders are—

  • (a)an order made under Part 3 of the Family Proceedings Act 1980; or

  • (b)an order made under section 42 of the Family Proceedings Act 1980; or

  • (c)an order or decree corresponding to an order described in paragraph (a) or (b) made under an earlier corresponding enactment; or

  • (d)an order, decree, or enactment corresponding to an order described in paragraph (a) or (b) made outside New Zealand that is recognised by the courts in New Zealand.

  (3)The provisions are—

  • (a)the appointment of the will-maker's spouse or partner as executor or trustee or advisory trustee of the will-maker's will; or

  • (b)the appointment of the will-maker's spouse or partner as a trustee of property disposed of by the will to trustees on trust for beneficiaries who include the spouse's or partner's children; or

  • (c)a disposition to the will-maker's spouse or partner, except for a power of appointment exercisable by the spouse or partner exclusively in favour of the spouse's or partner's children; or

  • (d)a disposition for the payment of a debt secured on—

    • (i)property that belongs to the will-maker's spouse or partner; or

    • (ii)property that devolved by survivorship on the will-maker's spouse or partner.

  (4)The following apply to a provision of a kind described in subsection (3):

  • (a)the provision is void; and

  • (b)in relation to the provision, the will must be read as if the will-maker's spouse or partner died immediately before the will-maker.

  (5)Subsection (4) does not apply if the will makes it clear that the will-maker intended—

  • (a)the provision to be effective even if an order of the kind described in subsection (2) were made; and

  • (b)in relation to the provision, the will not to be read as if the will-maker's spouse or partner died immediately before the will-maker.

This means the prior will is void and a new will is needed