An Australian coroner is due to make a final ruling on whether a dingo dog killed baby Azaria Chamberlain in 1980.
After the eight week-old baby went missing from their campsite, her parents were charged with her disappearance, and mother Lindy Chamberlain-Creighton with her murder.
She was later released when evidence was found to corroborate the dingo story, but doubts have lingered.
Azaria's parents recently presented new evidence to the coroner.
They have long argued that the open verdict recorded after an earlier review of the case left room for doubt about Ms Chamberlain-Creighton's innocence.
Earlier this year, the Chamberlains gave evidence to a coroner in Darwin recording a series of other attacks by dingos on humans, and on Tuesday the coroner will make a final verdict on whether a wild dingo dog was responsible for the baby's disappearance.
Virtually ever since Azaria vanished from her tent near Uluru (Ayers Rock) in 1980, Australia has been engrossed by the question of whether she was taken by a dingo.
In 1982, Ms Chamberlain-Creighton was found guilty of her baby's murder and sentenced to life imprisonment, while Mr Chamberlain was found guilty of being an accessory.
Both were later exonerated on all charges, after the chance discovery of a fragment of Azaria's clothing in an area dotted with dingo lairs.
It was a case that divided Australians and was even turned into the film A Cry In The Dark, starring Meryl Streep.
Three previous coroner's inquests proved inconclusive, but Azaria's parents are hoping that this time they will finally and officially be proven innocent.