He was found in a pool of his own blood by an off-duty doctor walking to his car in the early hours of December 11, 2014.
He was rushed to Liverpool Hospital in a critical condition but later died.
At the time of his death, police said Assoum was known to the force and was believed to be a member of the rival Brothers4Life clan.
Tarek Zahed is the national sergeant-at-arms of the Comanchero bikie gang, while his brother Omar Zahed also had links to the gang. Both had been warned by police they were marked men.
The brothers were ambushed by gunmen in a targeted shooting at Auburn’s BodyFit gym earlier this year.
Tarek was struck by 10 bullets in the head, body and legs, but survived the shooting
His brother Omar, 39, went into cardiac arrest and died after suffering gunshot wounds to his stomach, arms and legs.
National president of the Comanchero, Allan Meehan, posted a picture with Zahed on Instagram last week alongside the caption: “Welcome back tarek “hard2kill” zahed”.
It was the first public image of Zahed to appear since the shooting.
More to come.
Our Breaking News Alert will notify you of significant breaking news when it happens. Get it here.