Lachlan Young strangled Ms McGuire in their Sebastopol home, then placed her body in her ute and set it alight in bushland on Ballarat's outskirts, staging the scene to look like a suicide.
The brother of schoolboy Terry Floyd, who disappeared 50 years ago, has accused the Victorian government of breaking its public promise to fund the search for his remains.
Hundreds of young people from Ballarat, Victoria have taken part in ABC Takeover, an initiative that gives young people in regional areas a platform to share their stories.