Clothing found near the scene of Lois Tolley's death could belong to her killers, police say.
The 30-year-old was stabbed and shot at point-blank range in her Upper Hutt home on 10 December.
Police are seeking four men, one of whom yelled, "What have we done," as he fled the home the night of her death.
Officers previously said one or more women may have been involved.
Yesterday, police said they had found a black beanie, a single black sneaker, and single jandal at and near the scene.
Today, Detective Senior Sergeant Glenn Barnett said it was possible they belonged to her killers.
"But we've got to keep an open mind. In their speed to get away has a shoe come off perhaps? We can't rule that in or rule that out, that's why we want to see if we can identify [who owns them], speak to them and have that avenue of enquiry concluded."
Mr Barnett urged anyone who might know who the items belonged to to contact them.
He also gave more details about a white Toyota Hilux ute seen in the area the night Ms Tolley died, which police had also released a photo of.
"[It] was parked on Ward Street, and from CCTV footage it was seen leaving just before midnight on the 10th of December, at about the same time the killing was happening," Mr Barnett said.
"So this driver of the ute may have seen something, may have witnessed something in the street or noticed a suspicious vehicle, and we're just asking that they come and talk to us."
Earlier the police said they were looking for a silver, lowered car along with a blue Subaru also seen near Ms Tolley's home that night.
"They're still part of the inquiry, we're speaking to some people in regards to the silver vehicle, and still looking in regards to the Subaru."