Authorities are investigating the death, the outlet said.
Recently, New Zealand woman Helen Watson was hospitalised after returning from weight-loss surgery in Turkey.
RNZ reported she was unable to eat, drink or walk after her gastric sleeve operation abroad.
Watson told the outlet she immediately knew something was wrong after the operation as she “spewed up blood”.
“Even when I got to my room and through my six days there, I was vomiting blood – just vomiting, dry retching. I was so sick,” she said.
She decided to go overseas for the operation because, including travel, it cost about half of what it would have if she had gone private in New Zealand.
Health NZ’s chief medical officer Dame Helen Stokes-Lampard said the number of people returning from overseas operations with complications is increasing.
“Occasionally they get off the plane quite unwell, but more commonly complications are developing in those first few weeks after the operation,” she told the outlet.
Overseas operations causing potentially life-threatening complications are nothing new, with a Waikato bariatric surgeon warning about the problems in February.
Rowan French said overweight New Zealanders were being targeted by medical tourism companies for weight-loss operations abroad, RNZ reported.