Mrs Ridley was last seen camping east of Walwa on October 26 last year.

The 58-year-old and her husband Gary had been in the region, including in Albury and Tumbarumba, in the days before her suspicious disappearance.

Security camera footage and images were released after her disappearance, showing the couple at an Albury supermarket and Mrs Ridley's four-wheel-drive at a petrol station.

Mr Ridley's body was found inside the vehicle at Shelley with his death being treated as a suicide.

Police searched the region following the suspected murder-suicide but Mrs Ridley hasn't been found or heard from.

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The grandmother's death is being investigated by the Victorian coroner.

Detective Senior Constable Andrew Leonard said it was hoped a new search, which would take place in the Upper Murray between Corryong and the Wymah Ferry, would provide answers to Mrs Ridley's loved ones.

"We believe overnight on the 26th and into the 27th of October, there was an incident that took place between her and her husband," he said.

"This is the last time we've been able to confirm she was alive.

"Police are motivated by community expectations, justice, and for the family to have an understanding of what's occurred.

"Hopefully it will enable her family to move on with the situation."

There were reportedly intervention orders between the pair.

Detective Senior Constable Leonard said Mrs Ridley was well liked in the community.

"The whole situation has been quite traumatic for the family," he said.

"She had a lot of close friends up in Port Macquarie and her disappearance has certainly been felt.

"We are still looking for witnesses as we continue to investigate the matter."

Details of the search operation are still being finalised, but NSW officers will also be involved.

NSW police had been involved in the investigation, which is now being handled by Victorian authorities.

Anyone with information can contact Crime Stoppers on 1800 333 000.