JOHANNESBURG - The Hawks say they believe more people may be involved in the murder of the anti-gang unit investigator, Charl Kinnear.
Kinnear was gunned down outside his house last week.
One suspect has been arrested and will appear in court on Friday.
The Hawks say they are focusing on making more arrests.
"There is a lot that needs to be done, we have information that we have already gathered, we are expecting more arrests," said Hawks spokesperson Brigadier Hangwani Mulaudzi.