Police have said the gunman in Thursday's fatal mass shooting died of a self-inficted injury.
Police said on Monday they had completed their forensic examination of the central Auckland building where gunman Matu Reid killed two people and wounded several others on Thursday.
Post-mortem examinations have been completed on Reid and the two victims.
"The post-mortem has identified injuries inflicted when shots were exchanged with police officers, however it has also confirmed his fatal injury was self-inflicted," Detective Superintendent Ross McKay said.
The police investigation will continue at the same time as the critical incident investigation, and a coordinated learning review.
As standard procedure, the Independent Police Conduct Authority were also investigating.
Reid, 24, was a worker at the construction site where the shooting took place. He was was on home detention with a history of family violence, Police Commissioner Andrew Coster has said.
Reid walked on to the building site in lower Queen Street at about 7.20am and opened fire with a pump action shotgun. Solomona Tootoo, 45, of Manurewa; and Tupuga Sipiliano, 44, of Wattle Downs were killed in the shooting.
Eight people were also injured in the shooting, and four remained in hospital receiving care, including a police officer.
McKay said all the victims were recovering.
"The police officer injured is also continuing to make progress in hospital, however will have a long road to recovery from injuries. Police are continuing to ensure support remains in place for the victims as well as our injured officer."
"Preparation work will now get underway to ensure the site can be handed back to the construction company. At this stage, police anticipate this will likely be towards the end of the week."