Former bush fugitive Malcolm Naden told a psychiatrist he was a "serial killer" who'd murdered three other people and had dreamed of killing since he was aged 12, a Sydney court has heard.
Naden, 39, has pleaded guilty to the 2005 murders of Lateesha Nolan and Kristy Scholes, both 24.
In his sentencing hearing at the NSW Supreme Court on Thursday, forensic psychiatrist David Greenberg said Naden had told him during an examination that he had killed three other people.
"He told you he was a serial killer?" Naden's barrister Mark Ierace, SC, asked.
"Yes," Professor Greenberg replied.
The court heard that when police followed up on the allegations, there were no missing persons that fitted the descriptions Naden gave.
Prof Greenberg said when he spoke to Naden again last month and asked him about these "confessions", Naden laughed and said he'd lied.
Prof Greenberg said Naden was at "high risk" of reoffending.
"You have a person who has pleaded guilty to two murders, who has a history of violence prior to that, who reports that he started having fantasies of killing since he was 12 years old," Prof Greenberg said.
"He states that he will kill again and that his killing days are not over."
Earlier in the proceedings, Crown Prosecutor Mark Tedeschi, QC, sought a non-publication order on a number of details on the murders, describing them as "graphic", "offensive" and "distressing".
In addition to the two women's murder, Naden has also pleaded guilty to a raft of other charges, including indecently assaulting a 12-year-old girl and attempted murder of a police officer.
The former abattoir worker went on the run in 2005 - days after Ms Scholes was discovered strangled in the bedroom of his grandparents' house at Dubbo in NSW's central west.
Five months earlier, his cousin, Ms Nolan, had gone missing from the town. Her body has never been found.
His capture last year in the Hunter Valley marked the end of one of the state's biggest manhunts.
The court heard after his arrest Naden appeared "cheerful", but later displayed signs of depression, threatening harm on himself and others.
Mr Ierace said shortly after his arrest, Naden told prison psychologists he wished he could cry and he was glad when the police dog bit him during his capture because it allowed him to "feel some pain".
The court heard Naden had told Prof Greenberg he wanted life in jail.
The hearing before Justice Derek Price continues.