The 24-year-old man, whose name is suppressed, pleaded guilty earlier this year to six charges including the murder of Waugh.

He then dramatically sacked his legal team and signalled in April that he would apply to change the pleas and stand trial instead.

But in the ACT Supreme Court on Tuesday, the man confirmed through barrister Duncan Berents that he was now content to maintain his guilty pleas.

The 24-year-old was charged after he, together with co-offenders Peter Forster-Jones and Phouthakone Sikounnabouth, broke into Waugh's Watson unit in September 2016 in a bid to steal drugs and cash.

The trio, collectively armed with a shotgun, machete and metal pole, assaulted the people inside the unit.

One of the unit's occupants was so terrified he jumped out of a third-storey window to escape and fractured his spine.

Six weeks later, the three offenders returned to the scene.

This time, the 24-year-old man and Forster-Jones went up to the unit while Sikounnabouth remained outside in a car.

Forster-Jones shot and killed Waugh through the unit's front door, before he and the 24-year-old forced their way inside and robbed Waugh's partner.

Sikounnabouth then acted as the getaway driver.

Forster-Jones is now serving 30 years in jail after pleading guilty to offences including the murder of Waugh. Sikounnabouth is behind bars on a 12-year sentence for crimes including being an accessory to the murder after the fact.

The 24-year-old man will learn his fate later this year after confirming his guilty pleas. He is facing charges of aggravated burglary and three counts of assault stemming from the first home invasion, as well as murder and aggravated robbery from the second.

Justice John Burns said he would sentence the man on October 13.