Lilie James, 21, was found dead in the St Andrew’s Cathedral School gym bathroom late on Tuesday night, just before midnight, last week.
Police said she had suffered severe head wounds, and it is believed she was attacked with a hammer.
Tributes have poured in for the water polo coach, with her family issuing a statement saying they were “devastated and heartbroken”.
“She was vibrant, outgoing, and very much loved by her family and friends. We are tremendously grateful for the support of our community at this difficult time,” they wrote.
Today, the school will hold a special assembly as students return to the grounds for the first time since her death.
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It has also designated a dedicated area for people wishing to leave floral tributes and cards, which have been piling up at the school.
On-site counselors will also be available for students and teachers today, while some exams will be postponed.
The school gym will remain off-limits to students for the time being, though it is no longer a crime scene.
Police continue to investigate James’ death.
A body believed to be that of fellow school employee, 24-year-old Paul Thijssen, was pulled from the waters off Vaucluse last week.