Hamilton City Council has appointed PricewaterhouseCoopers (Pwc) to review Hamilton Zoo after the death of one of its staff last year.
Zoo curator and mother-of-two Samantha Kudeweh, 43, died after Oz the male Sumatran tiger attacked on September 20, while she worked inside the animal's enclosure.
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The Hamilton City Council won't release any details about how Oz came to be in the enclosure with Mrs Kudeweh.
Worksafe, the council's internal health and safety team and police - on behalf of the coroner - are also investigating the death.