Krystal Fraser was just days away from giving birth when she vanished from a town in Victoria's central north.
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The 23 year old, who was intellectually impaired, discharged herself from a Bendigo hospital against medical advice on the night of June 20, 2009.
She jumped on a train, telling people she was going to a party in the town of Cohuna but she never made it there.
Police have long believed Ms Fraser was murdered. An inquest into her disappearance and believed final movements will be examined in an inquest before coroner Katherine Lorenz, due to start Monday.
Almost three hours later, her mobile phone was pinged by a tower in Leitchville, 27km from the town of Pyramid Hill where she was last seen.
Investigators say there may have been a confrontation between the 23 year old and the father of her unborn child before her disappearance.
It's believed Ms Fraser's final phone call was from that man.
There is a $1 million reward out for information and a person was arrested and interviewed in 2018 but no charges were laid.
The inquest is expected to run through to July 20.
Australian Associated Press