Marco Tapia, 23, was shot dead in his family home in southwest Sydney's quiet Glen Alpine estate on September 1.
Two men, Vaifaalie Tuafuti, 22, and Omar Mohamed, 23, along with a 16-year-old boy - all previously extradited from Victoria to NSW - were on Tuesday charged with Mr Tapia's murder and a string of other offences.
Police would allege the trio collected a criminal contract and forced their way into Mr Tapia's home covered head-to-toe in dark clothing, armed with a handgun and crowbar, Detective Superintendent Joe Doueihi said.
''At this particular stage, we are not alleging any particular male pulled the trigger,'' the homicide squad commander told reporters on Wednesday.
Further investigations would attempt to uncover who fired a shot, he said, adding he believed authorities were close.
The homicide squad commander said none of the trio were co-operating with police.
Asked if it was ''case closed'' for Mr Tapia, Det Supt Doueihi said police had arrested everyone they were looking for but would continue to probe underworld links.
''We are still looking into the upper echelons of who facilitated this and who organised it," he said.
The trio hailed from Victoria and were known to police in the state for a combination of minor offences before extradition to NSW over unrelated offences, Det Supt Doueihi revealed.
Police will allege they picked up an interstate criminal "contract", possibly commissioned from overseas.
Their full charges constituted murder, two counts of special aggravated break and enter, committing a serious indictable offence with a weapon and possessing an unauthorised prohibited firearm.
Neither of the charged men applied for bail on Wednesday afternoon.
They will remain behind bars before their cases return to Wagga Wagga Local Court in November.
The 16-year-old was also due to face a children's court on Wednesday.
It's believed Mr Tapia was not the intended target of the botched alleged assassination - the first of two alleged hits in as many days.
Detectives alleged they had identified the intended target and Det Supt Douehi confirmed the person lived on Mr Tapia's street in Glen Alpine.
On September 16, two boys aged 14 and 16 were arrested and charged over their alleged roles in the murder.
Authorities allege they were involved in the preparation and clean up of the killing, but were still charged with murder for allegedly playing a role in a joint criminal enterprise.
They will remain behind bars until they next front a children's court on November 13.
Mr Tapia's parents, Sergio and Claudia, described the traumatic experience of witnessing their son's death.
Both were at home at the time of the shooting, along with their daughter.
"I remember him taking the last breath," Ms Tapia told Nine's A Current Affair earlier in September.
"Hate came to our house."
The bloodshed in early September sparked public and political outrage, with criminal activity claiming at least five innocent lives in recent times.
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