Janceski was fatally shot by a man on a dirt bike wearing a full-face helmet, sunglasses and a balaclava outside his Berkeley home south of Sydney at around 5pm on April 14, 2012.
Matthew Paul Wiggins, 33, is standing trial in the NSW Supreme Court, charged with the murder of Janceski and causing grievous bodily harm to his father Slobodan Janceski in the attack.
Crown prosecutors allege Wiggins murdered Janceski because of his suspected involvement in his friend Nikolovski's disappearance from his Unanderra home on Halloween 2011.
Nikolovski was not a member of the Comancheros but knew the outlaw bikie gang's then national president Mark Buddle.
His body has never been found and his Honda Accord was recovered by police burnt out in Macquarie Pass south of Sydney the day after he disappeared.
On Tuesday, Nikolovski's partner Paula Geldeard gave evidence that Robert Nikolovski had been seen highly agitated after his brother vanished and had harangued her to find out what had happened.
On November 7, 2011 in an SMS discussion between Wiggins and Ms Geldeard, Robert Nikolovski was described as a "goose" and a "madass fly".
"I said to him, 'You have to f***ing calm down Rob. You know you're losing it'," she wrote to Wiggins.
"This brother-in-law of yours is killing my life," Wiggins wrote back in a later message.
While Wiggins was upset about what had happened to his friend, he wasn't excessively emotional about it, Ms Geldeard admitted under cross-examination.
"He wasn't in a state of agitation about the disappearance in the same way that Robert Nikolovski was," defence barrister David Dalton SC said.
"Correct," Ms Geldeard replied.
She told the jury she had gone out for an evening with a girlfriend on October 31. That was the last time she saw her partner with phone calls and text messages going unanswered after about 11pm that night.
On November 4, 2011, police put out a press release asking for information regarding Nikolovski's whereabouts. The next day, Janceski's Berkeley home was burnt down in what police believed to be a deliberate act to destroy evidence.
Janceski experienced two gun attacks in 2012, firstly suffering injuries to his leg and groin with a shotgun at his home on January 29. Two men were charged over the incident, but were found not guilty by a jury. They were in custody at the time of the fatal shooting in April.
This is not the first time Wiggins' murder case has gone to trial in the NSW Supreme Court.
The retrial before Justice Natalie Adams continues.
