The man who died at Hidden Valley music festival has been named by police as 29-year-old Tuitu'u Junior Vaiangina.
Vaiangina suffered a cardiac arrest and collapsed at the event in Matakana, north of Auckland, shortly before 7pm on Sunday. He had a pre-existing heart condition, festival organisers told Newshub.
A police spokesman on Tuesday confirmed Vaiangina's identity.
"Police are investigating his death on behalf of the coroner," the spokesman said.
Chief of Army, Major General John Boswell, confirmed to Newshub that the 29-year-old was a member of the New Zealand Army. Second Lieutenant Vaiangina joined the Army in 2015 and was most recently based at Linton Military Camp.
"He served New Zealand with pride and will be sorely missed by his colleagues and all who knew him," Major Boswell said.
"The Army extends its sympathies to the family and friends of Second Lieutenant Vaiangina."
In a statement on Monday, Hidden Valley organisers said they were devastated by the incident and reiterated that the safety of attendees was top priority.
"Our heartfelt condolences go out to the whānau of the deceased at this time.
"We are deeply saddened by the sudden passing of one of our Hidden Valley attendees. As a live music festival that prides itself on providing a safe and enjoyable experience for all, we are devastated by this tragic event.
"Our thoughts, respect and aroha remains will the family of the deceased at this time."