A police investigation into the execution-style killing of Upper Hutt woman Lois Tolley has revealed the possibility of one or more females being involved in her murder.

Tolley was stabbed and shot at point-blank range in her Ward St home on December 9.

Police said today that they have spoken to a large number of people as part of the homicide investigation.

"From witness accounts, and information gathered, we know there were males seen running from the Ward St address, but Police now believe that one or more females were also involved," said detective senior sergeant Glenn Barnett.

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"The investigation team has spoken to a number of persons of interest, some of whom have associations to gangs."

A number of vehicles of interest have also emerged from various CCTV footage and witness statements police said.

Three of these cars are described as a blue vehicle, a white vehicle and a silver vehicle.

Police said the firearm used in the brutal murder is believed to be a shotgun and is still outstanding.

There are still no identified offenders, as the investigation team continues to work through persons of interest.

"We continue to appeal for those holding any information or who know anything that may be of interest to Police, to please contact us with that information," said Barnett.