Jackie Gasovski has spoken publicly about the death of husband John Gasovski, who left his Arncliffe home on June 9 telling his family he was headed to Canberra.

The body of Mr Gasovski, 48, was found at Jamberoo Mountain lookout on June 15. He had been shot once in the head.

Police said on Wednesday they had no idea why Mr Gasovski had been killed.

Ms Gasovski said her husband was a ‘‘good man with a big heart’’ who had been taken from his family forever.

‘‘I stand before you as a wife who has lost her husband, as a mother of four children who have lost their father,’’ she told a police news conference on Wednesday.

‘‘The pain we are feeling since John’s death cannot be described in words.’’

Ms Gasovski said the family wanted those responsible for his death brought to justice.

‘‘We want them arrested and charged so that no other family has to endure the relentless pain we have experienced every single day since John’s body was found.’’

Head of the Homicide Squad, Detective Superintendent Mick Willing, said police were yet to find a motive for why someone wanted Mr Gasovski dead.

‘‘With every homicide victim, we look into the victim’s background ... we are doing that with John.

‘‘But we are appealing today because we really are short. We really don’t know why he was murdered.’’

Homicide detectives have tracked some of Mr Gasovski’s moves after he left his home in a grey Hyundai iLoad van about 5pm on June 9.

An hour later, his van passed through the M5 tollway at Moorebank.

At 7.30pm, he was seen at a service station on the side of the Hume Highway at Sutton Forest.

Detectives believe he then turned around and drove his van north. He was spotted at a service centre on the northbound side of the highway at Pheasants Nest at 9pm.

But a short time later his van was again spotted heading southbound.

The van was not seen again until it was found on the slipway leading off the southbound service centre at Pheasants Nest on June 23.

Police do not know how long it had been there.

Supt Willing said police wanted any motorist who might have seen the van, or any suspicious behaviour at those service centres, to contact police.

“We want to hear from anyone who may have seen Mr Gasovski or his grey van in Pheasants Nest, Sutton Forest or any other part of southern NSW last month,” Supt Willing said.

“A lot of motorists now have mounted in-car cameras on their dashboards, recording as they drive.’’

Police have returned to Jamberoo in recent days to conduct further searches where Mr Gasovski’s body was found. The Pheasants Nest service station where the van was found was searched extensively on Tuesday.

Anyone with information is urged to contact Crime Stoppers on 1300 333 000.

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