A Chinese student has been fined $5000 for kicking a teenager whose skull had been fractured in a brutal attack in a Chinatown alley, with a magistrate saying she should be "utterly ashamed" of herself.

Sirui Luo, 21, kicked the Chinese high school student minutes after he was kicked and punched in the head repeatedly, while bystanders watched on April 15.

Sirui Luo leaving court. She was sentenced for assault after kicking a man who had been bashed and later died. Credit:Justin McManus

The teenager was taken to hospital with severe skull fractures and a brain haemorrhage but later died from his injuries, the court heard.

CCTV footage shows Luo standing in front of the 19-year-old as he sat in an alcove, and stepping forward to kick him.