Last week a 29-year-old man appeared in the High Court on a charge of accessory to murder.
He pleaded not guilty, had his name suppression continued, and was remanded in custody until the same hearing late next month. A trial date was also scheduled for March next year.
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A second man has also been charged with being an accessory to murder.
The 37-year-old was granted name suppression when he first appeared in the Waitakere District Court last month. He is due to appear in court again in the coming weeks.
A tip-off in March led police to the grisly discovery of human remains buried on the side of Rangipo Intake Rd, off the Desert Rd near Tongariro.
The body, which police say "had been in place for a period of time", was exhumed and an autopsy confirmed the case was officially a homicide inquiry.
Although the remains are yet to be formally identified, police believe they belong to Wang, who has been missing since 2017.
Detective Inspector John Sutton earlier said that a team of detectives was working on Operation Quattro and expected "further arrests". He said police were following a number of leads from information provided by the public.
The four arrests came nearly three weeks after police released a photograph of Wang, a Chinese national and permanent Kiwi resident.
Wang's family believed he had travelled overseas in 2017 and he was not reported as missing in New Zealand. Police had been in contact with his family in New Zealand and in China to make sure he did not leave the country under a different identity.
An apartment in Auckland apartment was examined over two weeks in late April. It was the second Auckland property to be searched as part of the investigation.