The 30-year-old Mluleki Nkosi, who confessed to killing his sister and burying her body in a shallow grave at his homestead in Nkohlahalo, KaBokweni, Mpumalanga, is expected to appear in the local court on Monday.
It is alleged that Nkosi was in a heated argument with his 44-year-old sister, Sibongile Nkosi, which ended in the tragedy last year.
Sibongile was stabbed with sharp objects.