Johan Kotze in court(Gallo Images)

A fourth person believed to have participated in the attack of a woman and the killing of her son has been arrested, Limpopo police said.

The 30-year-old was arrested in a pre-dawn raid in Hammanskral on Saturday, said Brigadier Hangwani Mulaudzi.

He was believed to be one of three workers forced at gunpoint to gang-rape the woman, allegedly acting on the instruction of her estranged husband Johan Kotze.

Kotze had been on the run since the January 4 incident and was arrested on Wednesday. Later that day a second person was apprehended.

Johan Kotze and his 42-year-old co-accused appeared briefly in the Modimolle Magistrate's Court on Friday, when the case was postponed until February.

Wearing blue jeans and a khaki shirt, Kotze held up his head while being photographed in court.

His co-accused covered his head with a blue work overall jacket when he emerged from the holding cells.

They will remain in custody until their next appearance on February 10.

Later in the day, police arrested another person in Hammanskral for involvement in the crime.

The ANC Women's League waved placards calling for the court not to grant the two bail when they emerged from a holding cell.

Magistrate Hannes Stoffberg ordered the media not to publish pictures of Kotze's co-accused or his identity as an identity parade still had to be held.

There was a commotion when Kotze arrived at the court complex in an unmarked white car.

Photographers followed the car taking pictures and protesters rushed to the entrance in the hope of seeing him, but police closed the gate behind the car.

"Why are you hiding him? We want to see him," shouted a man.

Tension mounted when police stopped people from entering the court building because court room number two was filled to capacity.

"We want him. Bring him here because you don't allow us to go inside," said a woman wearing ANCWL colours when police denied her access to the court.

Residents of Modimolle said they were angry that the crime had happened in their quiet town.

"We never had such a horrible thing here," said Poko Moree. "It discredited our town."

"He is no longer a person. He must be hanged," said Anna Manganyi.

Even animals did not treat each other the way Kotze had allegedly treated his wife, she said.

Community activist Jean-Pierre Rheeder said Kotze should be given a harsh sentence. "He should be an example to men who mishandle women."

Rheeder wore a white T-shirt on which was written in Afrikaans: "Only God will be merciful for Kotze, but not residents of Modimolle".

His stepson's funeral took place on Friday January 13.