Mfeka was arrested on September 8, 1996 in KwaZulu-Natal on a rape charge, and was linked to the strangling of six women in the Carletonville area between 1993 and 1996. He is recorded in the reference works as the Kranskop Killer.
That is the extent of the accessible record. The source is an encyclopaedia entry drawing on a contemporary report of the arrest. This roster's status field says "unknown," which is accurate: no trial, verdict, sentence or acquittal has been located, and the victims are not named anywhere available.
South Africa in the mid-1990s had a large number of serial cases running at once and a police service being rebuilt, and arrests announced in that period were not always followed by reported outcomes. That is context for the gap, not an explanation of it.
The entry is retained as a record of an arrest and an attribution. It should not be cited for six murders.