The 52-year-old was arrested after a neighbour reported the incident to police, said Warrant Officer Solomon Sibiya.
“He [the neighbour] informed the police that the suspect arrived late at night and a few minutes later he heard a heated argument between the couple,” said Sibiya.
The man allegedly drew a knife during the argument and attacked the woman. She sustained stab wounds to her back and neck and was confirmed dead at the scene.
The man would appear in the Kagiso Magistrate’s Court soon, Sibiya said.