A 13-year-old boy has become the third person charged with murder over the death of a Canberra man who was gunned down in his doorway.
The boy, from suburban Gungahlin, was arrested by ACT Policing homicide detectives when he attended City Police Station with his mother on Wednesday.
He was subsequently charged with joint commission murder over the June 2021 shooting of Glenn Walewicz, 48, at the victim's home in Phillip.
Magistrate Jane Campbell read that charge aloud when the boy, who was 12 at the time of the incident, faced the ACT Children's Court on Thursday.
Ms Campbell also formally charged the teenager, who cannot be identified, with the attempted aggravated burglary of Mr Walewicz's unit on the night of the victim's death.
That charge alleged the boy, in company with his fellow alleged killers, had tried to enter the home with intent to cause harm.
The case of the 13-year-old, who was wearing a dark jumper, remains before the court.
Detectives investigating Mr Walewicz's death have previously said he may have been a victim of mistaken identity, with the bullet that killed him when he answered a late night knock at the door of his Connorville Gardens unit possibly intended for someone else.
They have made five arrests this month as part of the ongoing homicide probe, with an 18-year-old man and NSW resident Gary Taylor, 24, both behind bars on remand after being charged with Mr Walewicz's murder.
The 18-year-old cannot be named because he was a juvenile at the time in question.
Dunlop man Reatile Ncube, 19, and Holt woman Nicole Williams, 38, have also been refused bail after they were charged with being accessories to murder after the fact.
None of those charged thus far have entered pleas.
Police are urging anyone with information about Mr Walewicz's killing to contact Crime Stoppers on 1800 333 000, or via the Crime Stoppers ACT website.
Anyone providing information should quote reference number 6821216.
