South Australian Police have made the "final arrest" into the shooting murder of Jason De Ieso who was gunned down at his panelbeating business in Adelaide's north in 2012.

Key points: Police previously said Jason De Ieso was an innocent bystander caught up in a bikie dispute

Police previously said Jason De Ieso was an innocent bystander caught up in a bikie dispute He was shot dead at his pannelbeating business in 2012

He was shot dead at his pannelbeating business in 2012 Police have arrested a ninth man in connection to the murder, and say it is the final arrest

Mr De Ieso was shot dead inside his Pooraka workshop after a group of men stormed his premises armed with a number of firearms.

Seywan Moradi, 33, of Walkley Heights, faced the Adelaide Magistrates Court this afternoon charged with murder, after being arrested in the morning.

He did not make an application for bail and was remanded in custody to face court again in March.

So far seven men have been charged with the murder of Mr De Ieso, with an eighth man charged with assisting the offenders.

Police Commissioner Grant Stevens said it was the most people charged over a single murder in the state.

"This number of people charged with the same murder is a first for us," he said.

"[It's] not something we're terribly proud of from a community perspective, but certainly something I'm proud of in terms of the way the Major Crime Investigation branch continue their efforts to resolve this matter."

Commissioner Stevens said the arrest was a key moment in the investigation.

"We've been working solidly on the De Ieso murder for several years in a very complex and challenging investigation so to have this finally to rest I think is a testament to the diligence of our major crime investigators," he said.

Mr De Ieso' death is alleged to have been sparked by an ongoing feud between the Hells Angels and Finke bikie gangs.

Prosecutors previously told the court that it believed Mr De Ieso's murder was in retaliation for an attack on one of the accused parent's house in Parafield Gardens.

De Ieso family 'continues to suffer from his death'

However, police said the 33-year-old victim had no links to either gang and was an innocent bystander.

In a statement Mr De Ieso's brother, Dino, said the final arrest had come as a great relief to the family.

"Since Jason's death there were times that we thought no-one would be held to account for his murder," he said.

"Today's arrest is a great relief to our family and we look forward to this matter being dealt with by the courts.

"Jason was an innocent person and his family and friends continue to suffer from his death."

Security vision of the incident shows nine men approaching Mr De Ieso's workshop with several of them firing handguns and a sawn-off shotgun into the entrance before running off.