Johannesburg - Joyce Khumalo, the former girlfriend of NPA head Mxolisi Nxasana laid an assault charge against him in 1986 because he allegedly beat her up, the Sunday Times reported.
When Joyce tried to dump him, Nxasana allegedly beat her so badly that she was admitted to hospital, Khumalo's mother, Aggrieneth Khumalo, told the newspaper.
Nxasana also allegedly attempted to strangle her during the breakup.
Khumalo then laid an assault charge against him in Nongoma, KwaZulu-Natal, and it was believed this was the case for which he paid a R50 admission of guilt fine, the newspaper reported.
Joyce died in 1998 in an unrelated incident.
Last month, former justice minister Jeff Radebe reportedly instructed Nxasana to resign after not being given a security clearance because of past brushes with the law. He has refused to resign.
The newspaper reported that he was acquitted on a murder charge in 1985 as it was in self defence, and that he had twice been convicted for assault, charged with reckless and negligent driving and resisting arrest. He was also fined R2000 for misconduct by the law society.
The newspaper said it could not get comment from Nxasana or NPA spokeswoman Bulelwa Makeke. Sapa could also not immediately get comment on the report from the NPA.