"My client gives a version that he never pulled the trigger of the gun. I think it's fairly well-accepted that it's not his gun.
"He provided a version to police that he didn't know it was a real weapon.
"He was told certain things by the deceased. But at the end of the day, people just can't play with guns."
The Gold Coast Bulletin also reports Boyd was shot through the heart with a single bullet.
Ruatara was remanded in custody but plans to apply for bail in the Supreme Court.
He's also scheduled to re-appear in court on February 21 for a committal hearing mention.
The New Zealander's adoptive mother Renee Louise Moseley, who is his alleged accomplice, remains on the run over the shooting.
It's alleged the 31-year-old was also at the party when Mr Boyd was shot, before the pair went on the run together before Ruatara handed himself in.
Moseley, a heavily-tattooed mother-of-one, is still at large and police believe she is travelling in a white Holden Commodore.
She bares the name 'Indi' on her neck, other names on her hand, chest and forearm, and designs featuring ladybugs, Piglet from Winnie-The-Pooh, a dreamcatcher and a baby rattle on her arms with a yellow background.
In 2011 Moseley narrowly avoided jail for trying to sneak the drug buprenorphine into a jail for a prisoner who befriended her but she barely knew.
Police remained at the scene of the shooting at Carrara on Saturday gathering evidence.
Boyd also allegedly had links to a bikie gang, however, his family have denied those reports.