Three brothers were ambushed in a deadly shooting after being invited to a Sydney industrial unit on the promise of settling a business feud, the victim's family says.
Wayne Williams, 33, was believed to be laying in wait armed with an assault rifle when Mick, Terry and Mark Bassal arrived at the Ingleburn factory shortly before 11am on Monday.
The Bassals say the proprietor of Inline Signs, Chantelle Tonna, had requested the meeting to resolve a dispute over an unfinished order for the family's construction company.
"We understand that, as they arrived at the premises, they were immediately shot and Michael Bassal died almost instantaneously," the family said in a statement on Tuesday.
Mr Bassal, 43, died at the scene while his two brothers were injured.
One is at Liverpool Hospital in a serious condition while the other has minor injuries.
The bloodbath triggered a tense, six-hour siege which ended only after Williams turned the gun on himself and three hostages were freed after 5pm.
Tonna, believed to be Williams' ex-partner, was led from the warehouse at the height of the siege and has been charged with concealing a serious indictable offence.
The 30-year-old has been granted strict conditional bail to appear in court next month.
The gunman's father, Peter James Williams, has faced court charged with discharging a semi-automatic rifle in a public place and concealing a murder committed by his son.
The 52-year-old was granted bail, on the condition he report to police twice a week, steer clear of witnesses and the signage shop, forfeit a $5000 surety and avoid international departure points.
He remained silent as he left Campbelltown Local Court flanked by two women on Tuesday before jumping into a waiting white ute.
Outside court, defence lawyer Roland Day said his client deserved bail.
"I'm just happy that the police did change the facts and now bail's been properly granted in this matter," Mr Day said.
"My client didn't fire a firearm at anybody, or fire a firearm at all."
Williams will return to court in May.
The gunman's links to the Finks outlaw bikie gang have prompted the Bassals to quash rumours of criminal undertones to the feud.
"Any speculation by the media that there was something more, and particularly any alleged criminal association between the deceased and the gunman, is nothing but speculation and we are instructed that this is completely unfounded," their lawyers said.
The Ingleburn complex remained cordoned off on Tuesday as investigations continued.
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