A $10,000 reward for information about missing Nelson man Leo Lipp-Neighbours has been extended for another three months.

Stefan Jensen, who suffers from mild dementia, disappeared on June 4 from his son's rural property in Pukekawa, 24km southeast of Pukekohe.

Police investigating the apparent killing of Raymond Piper say people have reported sightings of two cars linked to the case.

Police say they have evidence missing Kapiti man Raymond Piper has died a violent death.

Raymond 'Son' Piper has not been seen since May 15 when he disappeared from Paraparaumu.

Police are still working through possible sightings of a vehicle that might have been involved in the disappearance of missing Kapiti Coast man Raymond 'Son' Piper.

The body of an 18-month-old toddler has been found as police also investigate the death of a woman believed to be the girl's mother.

A man has been charged with murder after the body of a woman was found in a Tauranga house last night.