Dunedin's Kavanagh College staff, pupils and parents are in shock after learning that principal Tracy O'Brien died last night.
A letter sent to parents and staff said he died of a sudden medical event.
O'Brien, who was aged in his mid-50s, had been principal at the school for nine years.
In October last year, he announced he would be resigning at the end of term 2 this year, and was looking forward to retirement.
At the time, O'Brien said he had a wonderful leadership journey at Kavanagh College and enjoyed fantastic support from staff, pupils and the parent community.