Nearly forty years since Australia's first political assassination shocked the nation, police have made a fresh appeal for information on the murder of NSW businessman Donald Mackay.
Mr Mackay, 43, vanished from the car park of a hotel in Griffith, on the evening of July 15, 1977.
Three bullet casings were found and blood was smeared on the door of his locked van.
His body has never been found.
Since then, three men have been convicted of conspiring to murder the once-Liberal party candidate while a Royal Commission named six others who may have ordered the brutal killing.
Police have never been able to charge the hit man who pulled the trigger despite exhaustive inquiries, including a coronial inquest which found the father of four died of gunshot wounds.
Mr Mackay is believed to have been murdered in his rural hometown for telling police the whereabouts of marijuana farms owned by the Australian-born mafia.
On the eve of the 40th anniversary of his disappearance on Friday, NSW Police said they were fully committed to finding answers for his desperate family.
"Donald Mackay was a highly-respected member of the community and became well-known throughout Australia as an anti-drugs campaigner, and his murder - Australia's first political assassination - shocked us all," Griffith Local Area Commander, Detective Superintendent Michael Rowan said.
"This is further compounded by the fact his family has not been able to lay his body to rest."
Detectives attached to Strike Force Fitr have urged anyone with information to come forward.
"Investigators remain in contact with the family and I can't tell you the pain they feel for not knowing where his body is," Det Supt Rowan said in a statement.
"It's hard enough to know justice hasn't been served but never having the opportunity to lay your loved one to rest and say a proper goodbye is heart-wrenching."
The NSW government's reward for information that leads to Mr Mackay's remains was increased to $200,000 in July 2012.