Harriet Wran, the daughter of former NSW premier Neville Wran, is being questioned by police over a double stabbing at a notorious inner-Sydney housing commission unit block.
Three months after her father's memorial service in Sydney, the 26-year-old Ms Wran and a 35-year-old man were arrested on Wednesday in connection to the stabbing death of 48-year-old Daniel McNaulty in Redfern on Sunday night.
Lloyd Edward Haines, 29, was on Tuesday charged with murder, attempted murder and aggravated break and enter.
A second man, 42, was also stabbed multiple times in the attack and he remains in St Vincent's Hospital in a stable condition.
In a surprise twist, police on Wednesday arrested Ms Wran and the 35-year-old man in Liverpool.
Investigators earlier said they wanted to speak to anyone who has information about a red 1998 model Toyota sedan.
The car was later found in Waterloo on Wednesday.
Superintendent Luke Freudenstein on Monday said the attack, while not pre-meditated, wasn't random either.
Haines was refused bail on Wednesday and is due to reappear at Central Local Court on October 9.
His arrest came after the 42-year-old victim told police the attack had been carried out by three people in their 30s and 40s.
It is not yet clear what motivated the stabbings, but it is likely the attackers knew the victims and the violence may have escalated from an argument, police said at the time.
Neighbours reported hearing screams and yelling.
A state funeral was held for Ms Wran's father who was premier of NSW between 1976 and 1986, on May 1 in Sydney.
Harriet Wran, one of his five children, was at his side when he died.
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