Hamzy, 44, was gunned down in the driveway of his western Sydney home in Condell Park last October by two balaclava-clad gunmen.

Hamzy was the younger brother of notorious jailed gangster Bassam Hamzy, who is serving a 40-year jail sentence for a spree of killings and other crimes.

The murder remains unsolved and police on Wednesday released footage of two vehicles of interest in the investigation into the fatal shooting.

The first is a grey Toyota Rav 4, which was parked on Simmat Avenue on the morning of the murder.

Two masked men are seen leaving the vehicle just before the shooting before leaving in the same car shortly after.

Detectives also identified a black Mercedes Benz with the partial registration EHV*** as a car of interest.

The Mercedes was seen near Simmat Avenue on the morning of the shooting and later driving through the Moorebank area, including along Craig, Metcalfe and Selway avenues.

Police want to speak to the masked man driving the car.

The murder last year sparked fears of a gangland war between the Alameddine and Hamzy families in Sydney's southwest.

A spate of subsequent public shootings prompted police to turn Strike Force Raptor into its own squad.

Australian Associated Press