The arrest comes after police concluded an investigation into sexual assault accusations made by actress Amanda du-Pont last year
Phineas Molefo Boshielo is one of eight officers accused of assaulting three military trainees on a Johannesburg highway
She was raped, stabbed and had her throat slit by Frans du Toit and Theuns Kruger in 1994. The judge said they should never get parole
A psychiatric report however says Mafewas not aware of his conduct when he set the national assembly building alight
The South African National Defence Union said the victims have been told not to discuss the matter with the police while the Independent Police Investigative Directorate holds its inquiry
IPID has identified the victims of the beatings as military trainees