Police have charged an alleged gunman over the shooting death of Sydney tradie John Versace, who was killed outside his family home in May.

Mr Versace, 23, died in the driveway of the Condell Park property in what police at the time described as an "extremely brutal and execution-style killing".

A gunman ran toward Mr Versace after he had parked his ute about 10:30pm and fired 10 shots at him, police said.

He was treated by NSW Ambulance paramedics but he could not be revived and died at the scene.

Police said at the time the cleanskin plumber had no known criminal links and was gunned down "in front of his parents".

New charge comes after separate arrests last week

Last week, two men aged 19 and 43 were charged over their alleged involvement in the alleged murder and remain before t

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