Donovan Wearing, chief executive of Taratahi Agricultural Training Centre, has died at 52.
A spokesman from Wellington Hospital confirmed Mr Wearing died at 10.30pm on Wednesday.
Mr Wearing was admitted to Wairarapa Hospital in a critical condition on Tuesday but later transferred to the intensive care unit at Wellington Hospital.
Chairwoman of the Taratahi board and acting chief executive Jan Tatham said the centre had set up an email address, mycondolences@taratahi.ac.nz, to provide a channel for people to convey messages.
"It's a very sad time for everybody. He was taken to hospital on Tuesday in a critical state and died overnight, surrounded by his family."