- Sarah MacDiarmid was last seen at a Melbourne train station carpark in July 1990
- The 23-year-old's body was never found and no-one has ever been charged
- Police allege Ms MacDiarmid was attacked as she approached her red Honda
- Her parents issued a plea for information on the anniversary of the vanishing
- A $1million reward is on offer for those who can assist with the investigation
The parents of a missing woman have made a desperate appeal 30 years after their daughter vanished at a train station.
Sarah MacDiarmid, then 23, was last seen walking through the car park of Kananook train station near her home in Frankston, south-east Melbourne, on July 11, 1990.
Her parents, Sheila and Peter MacDiarmid, have issued a desperate plea for information on the anniversary of her disappearance.
Mrs MacDiarmid said she has struggled daily with Ms MacDiarmid's disappearance.
'That 30 years is just like that first night that she didn't come home and the next day realising that something bad had happened.
'I've just found it as hard today as it was when she disappeared.'
The Scottish-Australian woman was reported missing by her parents the night after she vanished. Police would later find Ms MacDiarmid's blood at the car park.
Forensic testing of the area where Ms MacDiarmid's red Honda Civic was parked led detectives to believe she was attacked as she approached her car.
Ms MacDiarmid's body has never been found but police uncovered drag marks leading into nearby bushes.
'If we knew where she was and we could get her back and give her the proper send off that she should have... it would mean just everything to the family,' Mrs MacDiarmid said.
The exact circumstances surrounding Ms MacDiarmid's death were never established despite a thorough investigation by the Homicide and Missing Persons Squad.
A $1million reward was announced in 2004 and is still on offer for those who can assist with the investigation.
Mr MacDiarmid said his daughter's disappearance had 'fairly destroyed our family life in so many ways.'
'Not bloody knowing that's the most dreadful thing.'
Mr MacDiarmid said locating Ms MacDiarmid would put his worries to rest.
'You'd feel your family would be complete again because you know where Sarah is,' he said.
Officer in charge of the Missing Persons Squad, Detective Inspector Andrew Stamper, said police had not given up on providing the MacDiarmid family with answers.
'To go 30 years without having any answers about what happened to your daughter or sister is almost unimaginable,' he said.
'Sarah's parents Peter and Sheila, and her brother Alasdair have had to show the kind of resilience no family should ever be asked to demonstrate.
'Peter and Shelia are getting older and to be able to give them some answers and any kind of peace, is something police are desperate to do,' Detective Inspector Stamper said.
A 1996 inquest ruled the 23-year-old was murdered at the hands of a mystery person or people at about 10.20pm.
Detectives have named violent prostitute Jodie Jones as the prime suspect and believe Ms MacDiarmid was robbed and attacked by the sex worker and three others.