Bill Spedding is due to give his side of the story at the inquest into William Tyrrell's disappearance after years of intense police and media scrutiny.
The washing machine repairman's opportunity to speak at NSW Coroners Court comes after a witness backtracked on a statement linking Mr Spedding to the case.
Bonny Hills man Dean Pollard told police in January 2015 he "definitely" saw Mr Spedding's work van coming out of a bush track hours after William went missing.
The three-year-old vanished from his foster grandmother's home in Kendall on the NSW mid-north coast about 10.15am on September 12, 2014.
But at the inquest on Friday, Mr Pollard backtracked, saying he told police the van he saw about 20 kilometres north of Kendall only "looked like" the van driven by his neighbour, Mr Spedding.
After further questioning and seeing a picture of Mr Spedding's van, Mr Pollard admitted what he saw couldn't have been repairman's van.
About the same time as Mr Pollard's original police statement, detectives searched Mr Spedding's home and business, tested several items and drained his septic tank.
No forensic evidence linking him to the boy's disappearance was ever found.
Mr Spedding has always vehemently publicly denied any involvement and has never been charged.
He has launched defamation action against multiple media outlets over their reporting of him in relation to William's suspected abduction.
Australian Associated Press