The current cost-of-living crisis has left many citizens, like Kathumba, without any savings.
Gen Khumalo was picked up on Thursday evening after landing at the main international airport.
The deal has been hailed by President Trump as "a great day".
It marks the second wave of arrests within two weeks targeting the SAPS' Crime Intelligence unit.
Kenya has witnessed an increasing crackdown on protests.
The explosion occurred at an electrical transformer near where students were taking final exams.
Dr Mohamed Omar takes over from Ambassador Mohamed Mohamoud.
Once the backbone of the country's agricultural sector, many of them are now elderly, visibly frail, battling illness and financially desperate.
The news was only announced to mourners in South Africa after a funeral mass had already finished.
