A 26-year-old woman accused of attempting to cover up a violent murder allegedly committed by her brothers in Canberra has been refused bail.

Eden Waugh, 37, was shot in the chest with a sawn off shotgun in front of his girlfriend in his government flat in Watson, on November 3 last year.

Detectives told the ACT Magistrates Court on Tuesday that Tavake Lee Pikula and Jason Pikula-Carroll were responsible for the murder.

The men are serving sentences in separate New South Wales prisons for other offences, and are yet to be charged over the death.

But their sister and half-sister respectively, Deanne Pikula, was today arrested at her home in Queanbeyan and extradited to the ACT, where she was charged with being an accessory after the fact.

The court heard she helped cover up the crime by hiding the murder weapon and tracking down a witness to convince them not to cooperate with police.

She was also accused of lying to officers.

Police said they intercepted conversations between her and Pikula-Carroll.

The following exchange was included in the statement of facts:

Pikula-Carroll: Oi, do you remember that me'afana [believed to mean gun or weapon] Deanne Pikula: Yeah Pikula-Carroll: Who'd you give that to? Deanne Pikula: Nobody Pikula-Carroll: What did you throw it? Deanne Pikula: I put it somewhere very safe Pikula-Carroll: Good, I'm going to need that when I get out Deanne Pikula: I don't know about that, it's a bit too safe Pikula-Carroll: It's okay, I've got another one anyway

Mr Waugh hurt during earlier home invasion

Detectives told the court Mr Waugh was badly hurt in a home invasion by an unknown associate of Pikula-Carroll just months before his murder.

Pikula-Carroll had allegedly arranged to buy drugs from Mr Waugh's partner the same day.

Police said the brothers visited Mr Waugh's home in November for retribution, because they believed he had gone to police about the earlier incident.

The court heard the pair called themselves gangsters and were involved in a crime group, involving family and friends in Queanbeyan and Canberra.

A statement of facts said Mr Waugh was involved in drugs, mainly ice and heroin.

Magistrate Beth Campbell refused Deanna Pikula bail.

She cried and waved to her sister and three-month-old daughter as she was led out of the courtroom.