Details are emerging of the murder of 21-year-old Lilie James | 7 News Australia

A recent relationship break-up is believed to be behind the murder of a young woman inside prestigious St Andrew's Cathedral School in the city.

Lilie James was just 21 and a water polo coach. Her 24-year-old ex-boyfriend Paul Thijssen is missing, with police searching for him.

For the latest Australian news and breaking news alerts, connect with 7NEWS online:

#7NEWS #BREAKINGNEWS