The men were arrested by KwaDabeka Police and are expected to appear in the Pinetown Magistrate’s Court.
Mark was shot dead when he approached five men wearing balaclavas who had entered his family’s house where they were having a birthday party.
The story of stealing and selling a baby for R5000 made headlines in 2015.
The CPFs urged residents to be aware of suspicious people and vehicles in their residential areas.
The arrested suspects are aged between 21 and 30.
The 33-year-old man was wanted after a half-naked body of a 31-year-old woman was found with a bullet wound to the head.
Detective, Philani Dumakude of Westville SAPS secured 15 year sentences for two robbers at the Pinetown court last week.
The visitors from Johannesburg were welcomed by three armed men.
It is alleged the arrest is a result of an argument between Oosthuizen and Reddy at the Malvern police station on Thursday, 28 September.
Nkululeko Mofokeng was sentenced to five years for house breaking, 15 years for robbery and life imprisonment for murder.
It is alleged the suspect stabbed his friend after they had an argument.