New Zealand Police have announced a $100,000 reward for new information about the death of Gisborne man Ronald Russell Allison in 2013.

Known as Russell, the 88-year-old died in a suspicious fire at his home address of 290 Whatatutu Road, Te Karaka, near Gisborne in the early hours of Friday January 25 2013.

Allison's death has been the subject of an open and active investigation for nearly eight years and Police is confident the fire was started intentionally to cause his death.

'Mr Allison lived alone and had limited mobility. A forensic scene examination established the area of origin was in the kitchen, and the wooden farmhouse was quickly razed to the ground,” says Eastern District Criminal Investigations Manager, Detective Inspector Rob Jones.

The investigation recently featured on the November 3 TVNZ episode of Cold Case during which Police highlighted the current status of the enquiry, including new information about an item of interest located on the lawn outside Allison's house.

'Mr Allison was a much beloved family man, respected farmer, war veteran and well-regarded long-standing member of his community. Due to the seriousness of this matter Police is now offering this reward.

'The investigation team is encouraged by the information we have received as a result of the recent screening of the Cold Case episode, but we know there are still people who can help us finally solve this case.”

The investigation team continues to be interested in the movements of a blue-coloured Nissan March car that travelled from Tauranga to Matatā, Tāneatua and Ōpōtiki and then in the direction of Te Karaka in the hours leading up to the fire.

'Police will pay out a reward of up to $100,000 for material information or evidence which leads to the identity and conviction of any person or people responsible for Allison's death.”

The offer of a reward will remain in force until April 30 2021.

The Commissioner of Police will determine the amount of the reward and will, if necessary, apportion payment where there is more than one claimant.

Immunity from prosecution may be considered for any accomplice, not being the main offender, who provides information or evidence to Police.

Anyone with information should go to their nearest Police station or call 0800 COLD CASE.