"Our thoughts continue to be with Mr Hay's family and friends at this difficult time," said McNaughton.
He said the Northcote community would have seen a police presence in place around Ocean View Rd while a thorough scene examination took place.
"We would like to reassure the community that this is thought to be an isolated incident, and we do not believe there is a wider risk to the public."
Last Wednesday armed police could be seen outside the Hillcrest property where a tent covered a section of footpath.
A neighbour reported hearing screaming before Police arrived the previous night.
An appeal was made for those with information to contact police by calling 105 and referencing file number 220817/9185 or call Crime Stoppers on 0800 555 111.