On his second day of opening submissions during the Supreme Court murder trial of eight men, crown prosecutor Jim Pearce KC told the jury Musa Alzuain shot Jason De Ieso in the head at his suburban Adelaide panel shop in November 2012.
Musa Alzuain, described as a close associate of the Hells Angels north crew at the time, was just 19 when he was accused of shooting the 33-year-old at point blank range.
The court has already been told Mr De Ieso was not the intended victim of the attack, and the men were looking for a rival member of the Finks bikie gang.
"The case against Musa Alzuain is that he is the man responsible for firing the fatal shot," Mr Pearce said.
"He fired the round from the shotgun that killed Mr De Ieso."
Musa Alzuain, now 30, is charged alongside his brothers Husain Alzuain, 35, and Mohamed Alzuain, 31, along with Daniel Mark Jalleh, 34, Ross William Montgomery, 38, Seywan Moradi, 36, Kyle Lloyd Pryde, 34, and Nicholas Sianis, 36.
All have pleaded not guilty.
A ninth man is also suspected of taking part in the attack but has since died.
Mr Pearce said while Musa pulled the trigger, the seven other defendants were guilty of murder through joint enterprise.
He said the Hells Angels had gone to the panel shop in search of the rival gang member over an ongoing feud, which included brawls, drive by shootings, home invasions and the firebombing of the Alzuain family home the night before the murder.
But the target of the attack had left the panel shop only minutes before security vision caught nine hooded men entering the premises firing guns.
Mr Pearce told the court Musa could be identified in the security vision and jury members would be able to compare that footage with other images of Musa taken at the time.
Mr Pearce said the jury would also see a large amount of security vision from homes, businesses, service stations and buses, tracking two small white cars "travelling in tandem".
They contained, he said, the defendants on their way from a home on Salisbury Highway to a tattoo parlour at Salisbury North and then the Pooraka panel shop.
He said the same technology had been used to track the gang back again to Salisbury Highway.
The driver of a small truck who saw the two cars race from the scene of the shooting, also tracked them to Salisbury Highway, he said.
The defendants, he said, had assembled at the Salisbury Highway home before the attack, and telecommunications data showed they had left their phones at the address.
"There was radio silence," he said.
In opening the case for his client Husain Alzuain, Winston Terracini KC said his client did not have to prove anything.
As far as his client was concerned, he said: "I am not there. I did not take part in the offence. I did not know the deceased man at all."
Grant Algie KC, for Mohamed Alzuain said his client accepted being a member of the Hells Angels but stressed it was up to the jury to decide if he took part in the attack.
"The central issue will be - was Mohamed Alzuain one of the nine people at Langford Street?" he said.
The jury will view the crime scene and other locations central to the case on Friday.
The trial, expected to take up to six months, continues.
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