A post-mortem examination was conducted last night.
"Police continue to make a number of inquiries around what happened to assist the Coroner, who will ultimately rule on cause of death," Johnson said.
"Police are working closely with the family and the University of Canterbury through this process.
"If anyone has information that may help police, please let us know by calling 105."
A University of Canterbury (UC) spokeswoman said the community was "saddened by the news of the sudden death of a student and the university is supporting those affected by the loss".
"UC is committed to supporting the safety and wellbeing of all staff and students," she said.
"We'd like to encourage staff and students to take care of themselves and each other and remind everyone that counselling is available and free for students and staff."