Zane Kilian appeared in the Cape Town Magistrate's Court on Tuesday on charges relating to the attempted murder of lawyer William Booth.
This new development is linked to the investigation into the murder of Anti-Gang Unit (AGU) detective Lieutenant Colonel Charl Kinnear outside his home in Bishop Lavis on 18 September.
Kilian was brought from Gauteng for the Booth shooting case and has become the sixth accused after five people were arrested earlier.
He is understood to have been drawn into the matter due to investigators' preliminary analysis of cellphone tracking.
In the Kinnear matter, Kilian, a private investigator, also faces charges of alleged violation of telecommunication laws relating to a so-called "ping list" containing thousands of numbers belonging to people whose locations were tracked.
Kilian walked up the steps of the holding cells into the dock of the Cape Town Magistrate's Court on Tuesday with a forward guard of rifle-bearing AGU members wearing bulletproof vests, and was followed by more heavily armed officers who positioned themselves around the court.
Booth was in the garage of his home in Cape Town on 9 April when shots were fired at him.
He was not physically injured, but was shaken.
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