The ex-soldier turned gun for hire, who cannot be named for legal reasons, killed senior Rebels bikie Nick Martin at Perth Motorplex on December 12, 2020 in a sniper-style attack.
The shooter used a .308-calibre rifle to target Martin from a distance of more than 300 metres while the bikie was sitting in a spectator area at the racetrack.
The bullet travelled through Martin's body and exited from his lower back before striking another man in his arm, seriously injuring him.
The convicted murderer returned to the witness box on Monday at the trial of David James Pye, 43, who allegedly paid the killer $100,000 for the hit at the racetrack.
Pye has pleaded not guilty to six charges including murder. His barrister David Hallowes SC probed the 39-year-old trial witness about claims he's made to his girlfriend, who also cannot be named, after Martin was gunned down.
"She said something along the lines to you, 'did you kill Nick Martin?'" the lawyer said.
"I told her that I killed Nick Martin of my own volition," the ex-army reservist said.
"You told her that you were a spook for the Australian government, correct?" Mr Hallowes said.
"She asked, yes," the gunman said.
Mr Hallowes suggested the former artillery gunner told his girlfriend he was on a top-secret government mission when he executed Martin.
"Yes, I misled her. I let her assume that it was still related to things going on," the hitman said.Â
"To protect her."
After that, the witness proposed to her and they became engaged, Mr Hallowes said.
"You were willing to, at that stage, propose to this woman you've been telling this series of lies to?"
"Yes," the shooter said.
He also admitted lying to Pye about working with the US Central Intelligence Agency, agreeing it was to "big note himself".
Mr Hallowes also returned to the killer's claim that Martin had raped an ex-girlfriend and that she killed herself.
The shooter agreed that as a result, he hated Martin who he viewed as a rapist, and that bikies were "terrorists" and "pieces of shit".
But the ex-soldier said he did not kill Martin off his own back.
The lawyer accused the shooter of being a compulsive liar and dishonest, which he denied.
"You are lying to this court when you say that Mr Pye asked you to kill anyone and paid you any money for that purpose," Mr Hallowes said.
"No," the ex-reservist replied.
The trial continues.
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