Police are confident they have caught Lois Tolley's killers on camera.

Descriptions of four male suspects seen at Tolley's home around midnight on December 10 were released to the public last night, as well as images of two vehicles of interest. Those men are believed to have shot the 30-year-old at point-blank range with a shotgun, as well as stabbing her.

Since the images were released, phones at the Upper Hutt Police Station have been ringing off the hook with tips.

Detective Senior Sergeant Glenn Barnett said the response from people around the Wellington region was positive.

"They're giving information about the vehicles, vehicles that they may have seen similar to the ones we're after in and around the area.

"We're following all these up to see whether we can rule the vehicle into the inquiry or whether we can rule it out."

Barnett said a large amount of CCTV footage was left to sift through.

"We're confident, now that we've started to review all the footage that we've downloaded, that this has captured our offenders and the vehicles that they've used."

Barnett said one of the four men of interest stopped outside the address and was visibly upset.

He said the man was heard swearing and yelling out "Oh my god, what have we done?"

"They've obviously realised that things have gone out of control, gone too far," Barnett said.

"They may have not been the person with the firearm, that person can come forward to the police in confidence."

He said it was only a matter of time before one of the four suspects cracked.

"The death of any person is a tragedy. The way this killing unfolded is an execution.

"Four people have gone to that address and those four people won't be keeping it to themselves."

It has been more than a month since Tolley was killed in the early hours of December 10.

Barnett said although the offenders were still on the loose, members of the public could be reassured of their safety.

"We don't think it was a random attack. We don't think that there is a group going around doing this and endangering the community."

Barnett said he did not know whether the four men of interest were in the Hutt Valley area or elsewhere.

He said police would spend the weekend combing through the CCTV footage they had collected.

The suspects:

Suspect one is a tall male, around 1.88m with a skinny build, aged 20s to 30s. He was wearing dark, baggy clothing, a hoody with the hood up, dark, low-slung pants, and possibly white underwear. Police also say he was carrying a large, rectangular object.

Suspect two is a male, shorter than the first suspect, with a skinny build, who was wearing dark, baggy clothing.

Suspect three is a tall male with a lean build, wearing dark clothing, long dark pants, and a hoody with the hood up.

Suspect four is a male who "sounded younger than the other suspects" and is believed to be the man who was seen upset outside Tolley's flat, Barnett said.

Police are also seeking information on two vehicles of interest that were spotted on CCTV footage in the area around the time of Tolley's death.

They are a blue Subaru and a silver, lowered, sedan-type car with black wheels

Anyone who has not yet spoken to police but who may have information that can help should contact the Operation Archer team based at Upper Hutt Police Station.