Revenge: Man kills his two daughters while trying to kill his ex-wife.

Charles Mihayo, 36, pleaded guilty to murdering Savannah, 4, and Indianna, 2, during a brief visit to his Watsonia home on Easter Sunday.

He had been involved in a bitter custody dispute with the girls' mother and asked her if he could see his daughters to say goodbye, because 'she'd won' and he planned to sever contact.

Prosecutor Gavin Silbert QC told the Supreme Court Mihayo had spent the morning of April 20 at Northland Shopping Centre, where he saw the film 'Captain America' and bought frilly dresses and shoes for his daughters.

Once the children arrived, he took them into his bungalow, alone, and dressed them in the 'flower girl' frocks.

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The court heard when four-year-old Savannah came outside to show her mother her dress, Mihayo called to her: 'Come back inside and we'll show Mum something else in ten minutes'.

The girls' mother became concerned when the house went quiet, and knocked on the door. She rang triple zero when Mihayo called out: 'You'll know when they get here'.

Police arrived a short time later, having been called by Mihayo himself. The court heard he phoned authorities and declared: 'It's done. I've killed them. I've killed my kids'.

When police officers forced him on to the ground to handcuff him, they asked why he had done it.

He gestured in the direction of his ex-wife and replied: 'You'll have to ask her'.

Mr Silbert outlined in chilling detail the description of the murders Mihayo had provided in his police interview.

He told detectives he had dressed Savannah and Indianna, then filmed them with his phone camera as they sang and danced to the song 'Let It Go' from the Disney movie 'Frozen'.

The pair went into the bedroom to play hide-and-seek and climbed on the bed.

The court heard Mihayo entered the room and 'next thing he knew' he had suffocated them both with a single pillow.

He bathed the girls and dressed them again. When police knocked on his door, he called out: 'A minute please'. He was wiping his hands with a towel when he opened the door and confessed to murder.

The prosecution argued the murders were a pre-meditated 'act of revenge' against his ex-wife.

Mihayo is being kept in protective custody in prison, under 23-hour-a-day lock down.

He will be sentenced at a later date.