Australian media report William Hunuki, 27, was stabbed in the abdomen at a unit in Bankstown.
Hunuki died after his life support was switched off in Liverpool Hospital about 9pm on Saturday.
Alexander John Dunleavy, 26, faced Parramatta bail court yesterday, accused of delivering the fatal wounds after an altercation.
He was also charged with assaulting an officer in the execution of his duty.
Mr Dunleavy, who police said was known to his victim, did not apply for bail and it was formally denied by the magistrate.
The victim's younger brother, Filisione Hunuki, 23, was also arrested and charged with two domestic violence offences and one armed with intent to commit an indictable offence.