Kelsey Waghorn was showing tourists around the New Zealand tourist attraction,also known as Whakaari,on December 9 when it erupted.
New Zealand's chief coroner has ruled that Australian teenager Winona Langford was killed in the tragedy,though her body has not been found.
Paul Browitt died in The Alfred on Sunday night taking the toll from the December disaster,which also claimed his daughter's life,to 18.
Giving thanks to the support of New Zealand during the fire crisis Scott Morrison says Australians will be inspired by the coming Test between the two nations.
Australian Chris Cozad died on December 14 from injuries sustained in the volcano eruption. Police indefinitely suspended the search for two remaining victims on Christmas Eve.
The person died while in Auckland's Middlemore Hospital on Sunday night.
Prime Minister Scott Morrison will return early from his Hawaiian family holiday on Saturday,having apologised for taking time off during the worsening bushfire crisis across NSW.
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New Zealand authorities say they believe the two bodies that remain missing after a deadly volcanic eruption last week have been washed out to sea and may never be found.
Australians killed or injured in the White Island disaster - and their families - will not be entitled to sue any negligent parties as they could in Australia,Britain or Canada.
Senator Marise Payne's remarks follow a police announcement that Sydney Winona Langford,17,is among two people whose bodies police are yet to find.