The cordon in Papatoetoe after Tangaru-Noere Turia was shot by police in 2021.
Tangaru-Noere Turia was showing signs of psychosis and wielding a shotgun when he was killed by police.
But a coroner says better mental health support and interventions could have helped prevent the 2021 shooting.
Turia had lived in Australia since he was six months old, and had his first run in with the law at age 17.
In her findings released on Wednesday, Coroner Erin Woolley said Turia was arrested dozens of times before he was deported to New Zealand under the 501 law in 2017.
