Detectives have searched an area around the Sanctuary Point boat ramp from the water and land as they investigate the stabbing murder of David McArthur.
The 49-year-old died after being stabbed in the chest at caravan park in Sanctuary Point on July 25.
Police have also released CCTV vision of a utility and person depicted at the boat ramp on the night of McArthur's death.
Homicide Squad, Detective Chief Inspector Wayne Walpole, said the search formed part of proactive investigations being conducted throughout the week.
"We have canvassed the waters around Sanctuary Point Boat Ramp – a location searched by investigators soon after David's murder back in July," he said.
"We have also reviewed CCTV from the area, which depicts a utility and an unknown person at the location about 8pm on Sunday 25 July 2021," Walpole said.
"Investigators don't believe the person or persons in this utility were involved in the murder of David McArthur; however, they may have crossed paths with those in the offending vehicle and we're keen to speak with them," he said.
Detective Chief Inspector Walpole said that Homicide Squad detectives remain dedicated to finding out what happened three months ago.
"We now have several new lines of inquiry which we are exploring – our door remains open to anyone who wishes to speak with us and help David's family get the answers they deserve," he said.
The investigation is ongoing.
Images: NSW Police