The man arrested in the killing of an elderly woman in the bush has been charged with murder.
The woman, who was in her 80s, was attacked by a man while riding her motorbike in the town of Nhulunbuy on Friday afternoon.
Her motorbike was parked in the middle of the road, in the village of Kew, and she had stopped in the process of making a stop on her way home.
She was killed in a clash between police and members of the Mobutu Sese Seko paramilitary group.
After the killing, the man was seen riding a motorbike with a rifle and holding it out to passersby in a desperate bid to protect himself.
Police are still investigating the motive behind the attack.
It is not known if the woman’s family has reported the incident to the police.
This is the second time that a member of the M23 has been arrested by the South African police.
In November, the former commander of the group, Joseph Mokonyi, was arrested by police on suspicion of assaulting a South African woman with a metal rod in the early hours of December 18.
He was later released after being interviewed.
However, Mokoniyi’s former commanders were arrested in August.