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The heartbroken families of Melbourne's fatal Love Machine nightclub shooting victims say the killers acted with inhumanity, violence and "not a care" about who they hit.
Relatives of security guard Aaron Khalid Osmani, 37, and Richard Arow, 28, spoke on Wednesday after a new clue emerged over the shooting outside the Prahran nightclub on April 14.
The shots, which also injured four others, were fired from a stolen black Porsche SUV, later found burnt out at Wollert.
The family said Mr Osmani looked out for his younger brothers and sister and three-year old niece, who he doted on.
"He lived with our parents and dedicated a lot of time to caring for them. He worked on the weekends but through the week he looked after our mum and dad," they said.
"Family was so important to him and we really miss him a lot."
Investigators are exploring whether the shooting was a revenge attack on the nightclub after patrons were ejected.