Ivan Milat suspected in 11 additional murder, missing persons cases

The NSW parliamentary inquiry is examining whether additional unsolved murders and missing persons cases may be linked to serial killer Ivan Milat. (AAP)

The head of the NSW Homicide Squad has told a parliamentary inquiry that a police review assessed 11 unsolved homicide and missing persons cases for possible links to Ivan Milat.

The inquiry also heard investigators considered dozens of additional matters beyond the seven backpacker murders Milat was convicted of.

The head of the NSW Homicide Squad has told a parliamentary committee that 11 cold cases have been assessed as potentially linked to serial killer Ivan Milat.

While giving evidence to a parliamentary inquiry into unsolved murders and long-term missing persons cases, Detective Superintendent Joseph Doueihi was asked whether Milat may have committed murders other than the seven he was convicted of.

Superintendent Doueihi said Task Force Air, which was established in 1993 to investigate the backpacker murders, carried out "a whole national review of a whole number of long-term missing person and unsolved homicides" linked to Milat.

Joseph Doueihi said the taskforce established to investigate Milat's crimes looked into scores of cases. (Supplied: NSW Parliament)

Superintendent Doueihi said investigators "categorised what they believed Milat was involved in as impossible, unlikely, highly possible".

He said the work involved examining "50 or so other matters" as part of efforts to assess possible links to the Belanglo backpacker murders and other unresolved cases.

Etched in Steven Clark's memory are the protruding teeth and moustache of the driver he says picked him up as a teenager — a man he now believes was serial killer Ivan Milat.

Superintendent Doueihi confirmed that 11 cases had been identified.

"Yes, so we have supplied those names to our counsel, who I believe are going to supply them to the committee," he said.

During questing about Milat's prosecution, Superintendent Doueihi said it was possible other homicides were part of the criminal investigation.

"I think — I'm not absolutely certain — that the DPP may have looked at other matters and there wasn't sufficient evidence to continue with the prosecution," he said.

Criminologist Xanthe Weston told the inquiry she used publicly available information on Milat's offending to build a behavioural profile.

Xanthe Weston created a behavioural profile framework used to assess cold cases potentially linked to Ivan Milat. (Supplied: NSW Parliament)

She and criminal psychologist Tim Watson-Munro used that framework to review the 18