A heavily pregnant woman who disappeared was murdered and the potential father of her child was likely involved in her death, a Victorian coroner has found.
Krystal Fraser, 23, vanished from Pyramid Hill in the state's north after visiting a friend's house on June 20, 2009.
She was due to give birth just days later, but has not been seen or heard from since.
Her last known call was from a Leitchville phone box, just before midnight. Her phone then pinged two towers, first in Patho and then Leitchville in the early hours of June 21.
Coroner Katherine Lorenz, who handed down her findings into the disappearance on Thursday, concluded Ms Fraser had died "very shortly" after the phone box call.
She found Peter Jenkinson, who was excused from giving evidence to the inquest as it may incriminate him, was likely the person who called Ms Fraser from the phone box.
"Krystal's death was caused by another person," Ms Lorenz told the court.
"I have had regard to the circumstantial evidence before the court, which satisfies me to the required civil standard that Mr Jenkinson was involved in her disappearance in some way."
Ms Lorenz said after calling Ms Fraser at 11.59pm on June 20, Mr Jenkinson was involved in transporting her from Pyramid Hill to Leitchville, where her phone pinged the towers.
Phone records indicated Mr Jenkinson was awake when her phone moved between those locations, she said, and he was unable to account for his whereabouts that evening.
She found Mr Jenkinson lied to police about his sexual relationship with Ms Fraser and concluded they were likely together around the time the baby was conceived.
"I accept the submissions of the parties that there is insufficient evidence for me to conclude to the requisite standard that Mr Jenkinson was responsible for Krystal's death," she said.
"However, there is no evidence that excludes Mr Jenkinson as a person who may have been involved in her death."
She said Mr Jenkinson stopped calling Ms Fraser from his mobile phone or landline and started calling her from the Leitchville phone box about a month before she vanished.
He did this to "conceal his contact with her before she disappeared," the coroner said.
Mr Jenkinson has denied any involvement in Ms Fraser's disappearance and said he did not speak to her using the phone box on June 20, in submissions to the inquest.
Ms Lorenz said she would refer the matter to the Director of Public Prosecutions as she believes an indictable offence was committed in connection to Ms Fraser's death.
She said it was regrettable the inquest could not resolve how Ms Fraser died nor the location of her and her baby's bodies.
The case remains under active investigation by Victoria Police, who have been contacted for a response.
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