The 33-year-old was arrested on Thursday and is the eighth man to face a murder charge over the execution-style killing, believed to be the result of a longstanding feud between the Hells Angels and Finks bikie gangs.
Mr De Ieso, 33, was gunned down at his Pooraka workshop and CCTV footage released by police showed nine men walking towards the front of the building and at least six of them carrying guns.
Shots were fired before the men were seen running away.
But police have insisted Mr De Ieso was an "innocent bystander" caught up in the protected feud and had no links to either gang.
Australia - BNN.