Heavily-armed police have uncovered a former drug lab at an abandoned property in regional NSW as they work to solve the mysterious death of a former bikie found dead in the back seat of a luxury car.
Ricky Ciano was discovered in a BMW on the side of a road in Oberon on Valentine's Day 2017 a day after his family reported him missing.
The 35-year-old, who survived an attempt on his life in 2015, had been living on the Gold Coast after severing ties with the Rebels outlaw motorcycle gang that year.
Exactly what he was doing in Oberon before he was found dead remains a mystery, but tip-offs from the public led detectives to search an abandoned farmhouse outside the town on Tuesday.
The riot squad, bomb squad, police divers and chemical operations members of the drug and firearm squad swooped on the property which they believe Mr Ciano may have visited the weekend he died.
A search of the home revealed it had previously been used to produce cannabis and methylamphetamine, police say.
"Based on what we found there, we are confident there are people who know more about Mr Ciano's death," Detective Chief Inspector Jason Dickinson said in a statement on Friday.
"Our inquiries are very much ongoing, and we are determined to provide answers to Mr Ciano's family, so we urge those who have knowledge of what happened at Oberon to contact police."
Police have previously said Mr Ciano died of a suspicious lethal drug overdose and they haven't ruled out murder.