A man jailed for his part in the deadly shooting of police accountant Curtis Cheng in Parramatta in 2015 has had his conviction quashed.
Mustafa Dirani will now face a retrial was ordered.
He was serving a maximum 28-year sentence for acting as a lookout as the terror attack was planned.
Cheng was shot and killed by 15-year-old Farhad Jabar outside Parramatta Police Headquarters in 2015. He was then killed by police in an exchange of gunfire.
Raban Alou was jailed for a maximum of 44 years for masterminding the attack and Talal Alameddine was jailed for almost 18 years for sourcing the gun.
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