Josaia Vosikata, 27, pleaded guilty earlier this month to the murder of Ms D'Addario.

Vosikata was arrested following a massive manhunt in early 2015. That manhunt ended when he was found hiding in bushes on the NSW South Coast.

He killed Ms D'Addario, placed her body in the boot of a Hyundai Getz, and drove interstate.

The pair had been missing for several days when Vosikata was pulled over by police. He fled, prompting a frantic search along the coast.

A Channel 7 cameraman later noticed him hiding in bushland near Bermagui, and police were notified.

Vosikata was charged with murder, and also with indecently interfering with a corpse and trespass.

The case appeared again in the ACT Supreme Court on Wednesday, and Vosikata, represented by lawyer Paul Edmonds, was re-arraigned.

He again pleaded guilty to the charge of murder.

This time, however, his plea to murder was taken in full satisfaction of the other charges. That included the charge of indecently interfering with a corpse.

The other offences will now be treated as "related offences", meaning they will be taken into account by the sentencing judge, but will not attract individual sentences themselves.

The matter will re-appear in July for a short disputed facts hearing relating to the trespass charge.

Vosikata will be sentenced once that hearing is completed.