Nicole Williams, 38, was taken into custody on Tuesday and brought before the ACT Magistrates Court to face that charge and a related allegation of conspiracy to commit aggravated burglary.

Charges read to her by magistrate Glenn Theakston alleged she assisted the 18-year-old man accused of murdering Glenn Walewicz last June to escape apprehension or prosecution.

Williams, who sat with her arms folded in a remote room as she faced court via audio-visual link, did not enter pleas.

She was represented by Aboriginal Legal Service lawyer Jonathan Cooper, who told the court there would not be an application for bail.

Mr Walewicz's mother, sitting in the public gallery beside a homicide detective, watched on as Mr Theakston accordingly remanded Williams in custody.

Williams joins the accused killer, who cannot be named because he was a juvenile when Mr Walewicz was gunned down, and fellow alleged accessory Reatile Ncube behind bars after they were also arrested in recent days.

Homicide detectives apprehended the trio after nearly a year investigating the death of Mr Walewicz, who was shot dead when he answered a knock on the door of his Connorville Gardens unit in June 2021.

Detective Inspector Mark Steel revealed on Monday that police were investigating the possibility Mr Walewicz, 48, was not the intended target of the shooting, with the murder perhaps a case of mistaken identity.

The alleged killer, like Williams, did not apply for bail when he faced the ACT Children's Court on Monday morning.

Ncube, 19, did seek conditional liberty when he fronted the Magistrates Court on Saturday, but magistrate James Stewart refused his bail application.

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Police documents tendered in the Dunlop teenager's court case allege he told a friend he needed to "make some shit up" after learning detectives wanted to speak to him about what his car had been doing in the vicinity of the murder.

Investigators also claim to have intercepted a phone call in which Ncube discussed plans to "get rid of" two shotguns.

Williams and Ncube are both due back in the Magistrates Court on June 20.

The alleged murderer is expected to face the Children's Court again a week after that.

Detective Inspector Steel, of ACT Policing, said on Monday the initial arrests had been "a great result".

"This will hopefully provide some comfort for Mr Walewicz's family that the detectives are still working hard on this investigation some 12 months on," he said.

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