A killer teenage girl appeared “normal” just hours after fatally stabbing a mother to death during a street brawl organised on an Instagram group chat, it can be revealed.

Kristie McBride died after she was stabbed multiple times during a fight between two groups of teenage girls, after a confrontation which had been planned the night before.

The girl who struck the fatal blow was among four who pleaded guilty to manslaughter ahead of a murder trial at the NSW Supreme Court.

They cannot be named due to their age and were listed by court as LT, DR, KT, and TH.

The agreed statement of facts, which has now been released to the media, reveal chilling details of the south Sydney brawl and subsequent death of Ms McBride, including how the then 15-year-old who stabbed the mother multiple time

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