Raban Alou, 20, had pleaded guilty to his role in the murder of Curtis Cheng, 58, who was shot by a teenager outside a Sydney police station in 2015, reports the BBC.
Alou is the first person in Australia to be jailed for aiding and abetting a terror act that was then carried out.
In handing down his sentence, Justice Peter Johnson said Alou had "played a lead role" in the attack and shown no remorse for his actions.
Justice Johnson said the outburst reinforced Alou's "almost hopeless" prospects of rehabilitation.
After being sentenced, he saluted and said "this is only the beginning".
According to prosecutors, Alou supplied a Smith & Wesson .38 revolver to 15-year-old Farhad Jabar at a Sydney mosque on October 2, 2015 -- the day of the shooting, the BBC report said.
Jabar then murdered Cheng, a police accountant, outside the New South Wales police headquarters in the suburb of Parramatta. The teenager was shot dead by responding police officers.
Alou will be eligible for parole in 33 years.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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