Police are seeking a man and a woman believed to be travelling in a stolen car, used to collect two people involved in a fatal crash on Adelaide Avenue.
In April the single-vehicle crash resulted in the death of a 15-year-old Indigenous boy, who was taken to hospital with injuries but later died.
Two other people were in a white Toyota Camry when it crashed into a concrete barrier on the State Circle and was found on its roof in the middle of the road shortly before 5am.
The other people in the car are believed to have climbed out of the Camry and were collected by a stolen black Genesis GV80 SUV that then fled the scene, police said.
Police have claimed the stolen car was later found partially burnt out in Theodore.
Extensive forensic testing of the vehicle is said to have recovered DNA not belonging to the car's rightful owner.
Police are now once again calling for all people involved in the crash - the two occupants of the Genesis, and the two other occupants of the Camry - to come forward.
In a statement, Detective Sergeant Jonathan Turkich said police were extremely happy with engagement from members of the public following numerous calls for information about the incident.
"Police often need assistance from the public in order to put the final pieces together in an investigation, and the information provided by the public in this investigation has been tremendous," Detective Sergeant Turkich said.
"We have spoken with a number of people who have provided important information to assist this investigation, and I would like to thank them for coming forward.
"Police hope to make arrests in this matter very soon, so I would once again urge any of the people who were travelling in either the Camry or the Genesis that terrible night to come forward before police come knocking on your door."
Anyone with information that can assist police is urged to contact Crime Stoppers on 1800 333 000, or via the Crime Stoppers ACT website. Please quote 7726381. Information can be provided anonymously.