Tete was outside his home in Cape Town with a young woman when he was shot dead. The woman was also shot and is still being treated in hospital.
The BBC reports that South African police have arrested four people suspected of being involved in the murder. One of those arrested has been charged with murder and attempted murder, according to the BBC.
Two of the others arrested are suspected of illegal possession of weapons, but it is still unclear whether they are also suspected of murder.
Zolani Tete held the bantamweight world title between 2017 and 2019. He also became the super flyweight world champion in 2014.
Earlier this year, he had served a four-year suspension for doping.
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