Vlassakis was the youngest of four men involved in the Snowtown serial killings between 1992 and 1999, which became known as the "bodies in the barrels" murders. He was sentenced to life imprisonment with a non-parole period of 26 years for the murders of Fred Brooks, Gary O'Dwyer, David Johnson and his half-brother Troy Youde.
Last year, the South Australian Parole Board approved his release, but the state government sought a review. The Parole Administrative Review Commissioner ultimately found the Attorney-General failed to establish grounds to overturn the board's decision. The decision was upheld in September, and Vlassakis was transferred from a prison to the pre-release centre in Adelaide's northern suburbs last month.
The Adelaide Pre-release Centre, located alongside Yatala Labour Prison, allows prisoners to transition from custody to the community. The Parole Board will monitor Vlassakis's progress and determine the conditions he must comply with once fully released. Parole Board chair Frances Nelson KC has said Vlassakis will be subject to standard parole conditions, including a curfew, restricted movements, and random drug and alcohol testing.