"This is a significant milestone in the investigation, however, the dedicated CIB team still has a lot of detail to work through in order to ensure a robust, fair, and thorough investigation," Detective Inspector Steve Wood said.
"We know the arrest for murder will assist concerned members of the community, and help the families and friends of the victims feel safer as they recover from their ordeal."
"The families of David Clark and Anastasia Neve are aware of the arrest, and say they are relieved and thankful."
Members of the public are asked to phone Dunedin Police on 03 417 4800 or call Crimestoppers anonymously on 0800 555 111 if they have any relevant information.