Janie, one of the oldest chimpanzees in captivity and for years part of Auckland Zoo's "tea-party chimps", is dead at the age of 60.
Janie had multiple health issues and was euthanised yesterday.
The zoo's head of life sciences, Kevin Buley, said it had become clear staff could no longer maintain her standard of welfare.
"Janie was and always will be a special part of Auckland Zoo and we are very saddened by her loss.
"While it was a heartbreaking decision, the overwhelming desire to preserve Janie's dignity meant [euthanasia] was the right one."