An area along SH30 and a large forest area behind properties of interest were also searched.
One man has already been charged with Whyman’s alleged murder.
Detective Inspector Lindsay Pilbrow said, however, police believed others were involved in the events that led to her being killed.
“There are also people who, after the fact, have protected these individuals and their involvement,” Pilbrow said.
“We know these people are still in the area, and that we will have spoken to some of them during the investigation. They will see us again, at their door, or conducting further inquiries and searches in the area.”
Pilbrow appealed to anyone with further information to speak up.
“While police have received a lot of information from the public, we really want those who know what happened to reach out to us. Six months is a long time to hang on to secrets and the guilt.”
Pilbrow said people might have information about the shooting, the motor vehicle used or might have overheard suspicious conversations.
“That’s information we need to know.
“What you think is insignificant could be a critical piece to the puzzle.
“Korrey was innocent and didn’t deserve to die. She was a loving mother to three young children, and her life was taken needlessly.”
- Anyone with information is asked to contact Police on 105, or online at 105.police.govt.nz, quoting file number 220925/5119.
- Information can also be provided anonymously via Crimestoppers on 0800 555 111.