Rogerson and McNamara blame each other for Jamie Gao's death
Mr McNamara's barrister Kara Shead told the jury on Tuesday: "Roger Rogerson shot and killed Jamie Gao".
"He then threatened Mr McNamara's life."
Ms Shead said Mr McNamara, 56, was "terrified" and agreed to help Mr Rogerson dispose of Mr Gao's body.
Mr Thomas said Mr Rogerson, 76, opened the shed door and saw Mr Gao "dead on the floor with a handgun lying near him".
"He says Mr McNamara appeared to be shocked and said a gun had been pointed at him by Jamie Gao and he was threatened.
"A struggle occurred and Jamie Gao was shot twice.
She said Mr Gao was a member of an Asian triad and Mr McNamara met him several times as he conducted research for his upcoming book on Asian gangs and drug dealing in Sydney.
Ms Shead said Mr Gao had become increasingly worried because he had skimmed money off the top of some drug deals and was also a police informant. He was concerned the triads were after him.
Mr McNamara was unaware of any alleged drug deal between Mr Rogerson and Mr Gao and did not know Mr Rogerson was in possession of a handgun until the shooting, Ms Shead said.
Mr Rogerson also denies any knowledge of a drug deal, Mr Thomas said.
He said Mr Rogerson went to Rent-A-Space that afternoon at Mr McNamara's request because Mr McNamara was also concerned about the triads and wanted Mr Rogerson to watch out for him.
Earlier on Tuesday, Crown Prosecutor Christopher Maxwell QC said the prosecution couldn't prove which of the accused fired the .22 calibre handgun, fatally wounding Mr Gao. But he said even if it was Mr McNamara during those three minutes Mr Rogerson was outside the shed, the latter is also guilty of murder.
He said that this was because Mr Rogerson and Mr McNamara were part of a joint criminal enterprise to murder Mr Gao and then steal the 2.78kg of methylamphetamine he had brought to sell to them.
"These two men were engaged in a joint criminal enterprise to kill or at least cause grievous bodily harm to Jamie Gao".
The first witness to take the stand was Mr Gao's cousin and close friend Justin Gao.
He said he had no knowledge of Mr Gao having a history as a drug dealer: "He always made it clear to me that he would never stoop to that and he was better than that".
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