“The City of Cape Town’s Special Investigations Unit, who is working with police and the Hawks on the case, were on scene when the suspect was arrested in the early hours of Saturday,” she said.
“He has since been released due to a lack of evidence.”
This follows the release of two men arrested in Kleinvlei on Wednesday, also due to insufficient evidence.
Koopman, 53, was gunned down while on duty on Monday after having lunch at his Eerste River home.
His wife Katriena on Thursday told News24 her son had seen his father being killed.
This after his two attackers greeted Koopman before accosting him and firing the fatal shot.
His service pistol and radio were stolen.
Faro said while they were disappointed that no one was in custody for the shooting, they expected a “breakthrough soon”.
“The police and the Hawks have indicated they are following up on a number of leads,” she added.
A R50 000 reward is also being offered by the City for information on the gunmen.
A memorial service is being planned for Wednesday while the funeral will take place on Saturday.
Source: News24
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