She pointed out Mbatha as the policeman standing over Mokoka when the gun went off.
“It was him,” she said.
She estimated that about six shots went off before the policeman put the weapon down next to Mokoka.
On Monday, his aunt Mpumi Mokoka told the court a group of police came knocking on her door that night, looking for her nephew.
They told her they suspected he was a member of a gang called the BWA, and that he owned a firearm.
She said she heard seven shots, but could not identify Mbatha as the person who pulled the trigger.
Mbatha has pleaded not guilty.
“I don’t plead guilty to murder but to culpable homicide. It was not my intention,” he told the court on Monday.
Mbatha claimed the gun went off when he bent over to search Mokoka.
The trial continues.