On January 14, 2017, Mr Gargasoulas was arrested at his mothers' address after brandishing a knife.
He was already wanted by police over traffic offences, including an incident where he drove on the wrong side of the road.
On January 17, 2017, Mr Gargasoulas told an associate that if we was chased by police again he would attempt to strike someone in a bid to make his escape.
At 2.15am on January 20, Mr Gargasoulas and his brother, Angelo, got into an argument at their mother's apartment. Mr Gargasoulas followed Angelo into the street and attacked him with a large kitchen knife.
Ms Judd said Mr Gargasoulas told an associate that he believed he had killed his brother.
Mr Gargasoulas allegedly told another associate: "I'm going to do something drastic, take everyone out. Watch, you'll see me tonight on the news."