Police have charged a 19-year-old man with the murder of 69-year-old Auckland woman Cun Xiu Tian.
Family members found Ms Tian's body in her home in Te Atatu in west Auckland on Friday.
The police said she had suffered a horrific assault.
Yesterday, they asked the public for sightings of a man wearing a green and white tracksuit in the area around the time of the attack.
The arrested man, from Te Atatu, has also been charged with sexual violation - and will appear in the Waitemata District Court tomorrow morning.
Detective Senior Sergeant Roger Small said the arrest would be a relief for the community, and they wanted to thank the public for their assistance.
He said the family were being offered victim support.