De leso was working at his auto repair workshop when he was fatally shot in November 2012.
It took the jury more than 30 hours of deliberations over six days to find brothers Musa, Hussain and Mohamed Alzuain, Ross Montgomery, Daniel Jalleh, Nicholas Sianis and Kyle Pryde guilty.
They were sentenced to life in jail, but almost as soon as the verdicts were handed down, they lodged appeals.
This morning, their bid to have their convictions overturned was successful, with the court granting the appeal on the ground that the judge had erred in an aspect of the case relating to joint enterprise.
Major Crime detectives, who worked tirelessly for a decade to get to trial, had to break the devastating news to the victim’s family.
All of the accused were alleged to be members, prospects or close associates of the Hells Angels at the time of the shooting.
The trial heard De Ieso was caught in the crossfire of an escalating bikie war between the Hells Angels and the Finks.
De leso was never the intended target, with the court hearing it was rival Finks gang member Charles Bonici, who’d left the workshop only minutes earlier.
A date for retrial is yet to be set, but it’s expected to be equally as long and expensive as the last, which cost taxpayers millions.
