Three people have been arrested and charged with the murder of south Auckland woman Meliame Fisi'ihoi.
The 57-year-old was killed in her Favona home on Calthorp Cl on January 15, 2020, in what was believed to be a case of mistaken identity.
The case remained unsolved for over a year, but on Thursday Det Snr Sgt Karen Bright of Counties Manukau police confirmed three men aged 19, 22 and 28 had been jointly charged with her murder.
The men are expected to appear in the Manukau District Court on Thursday.
Bright said police had worked "tirelessly" to find those involved.
"Police's commitment to this investigation has never wavered and we were always confident that arrests would ultimately be made, however some investigations are more complex and challenging than others and can take a significant amount of time and effort to resolve.
"We hope the arrests today provides Mrs Fisi'ihoi's family with some degree of comfort following what has been an extremely difficult time for them."
She thanked the Favona community for their help with the investigation, known as Operation Truro.
Fisi'ihoi was reportedly shot when she answered the door to her home around 2:50am to someone asking for her son.
"She got up and... just said that [her son] wasn't there," a source previously told the NZ Herald. "They insisted and so she went to open the door and - bang."
There had been another shooting at the same house only a month earlier, which put a man - believed to be her son - in hospital.
A year on from her death, Tongan community leaders called for those responsible to front up and hand themselves in.
"The police are taking far too long and there's no reassurance to the community," Pakilau Manase Lua said.
"Particularly to the local ones here in Mangere about what's happening. There's just a big blanket of silence... totally understand they have to investigate and that but talk to your community."