Police spokesperson Brig Jay Naicker said a case of culpable homicide was being investigated by Umzimkhulu police.
"It is alleged that on November 18 at 15.20, a 51-year-old woman was taken to hospital after she was struck by a bullet on the left of the hip. She died in hospital.
"It is alleged the weapon was brought to court to be entered as evidence in a house robbery case when it accidentally discharged in court. Unfortunately we cannot divulge further information as the investigations are at a sensitive stage," he said.
By Tuesday morning, numerous messages of condolence had been posted on Watt's Facebook page.
“I am totally shocked, words can't express how devastated I am,” one friend wrote.
Another said the prosecutor's death was “unnecessary”.