It’s an incredible case of police bungling that left the prime suspect in the murder of a beautiful young woman roaming the streets for 42 years.
On a cold September evening in 1969, 20-year-old Anne Zappelli left her friends at a drive-in near Geraldton in Western Australia, to walk back into town.
Watch the Sunday Night investigation below
Passing motorists later witnessed two men slow down near Anne, and one even saw them stop and get out – but none of them stopped to help.
Anne Zappelli was never seen alive again.
Two days later, her bruised and battered body was found just 1.5km from the drive-in.
A series of errors by investigators meant that the two prime suspects were never held to account.
So how did police get it so wrong?
This story originally aired in 2012.