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.
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.