In a statement on the Timaru Boys' High SchoolFacebook page, the school said it was deeply saddened by George's death.
"The boys, staff, and wider Timaru Boys' community was deeply saddened yesterday when informed that George Hill, a 2017 Year 13 student, died in the weekend.
"Our thoughts and prayers are with his family and other loved ones in this difficult time."
The statement said George had enjoyed taking part in pipe band drumming and was a talented First XI Football member who showed maturity and natural leadership.
"Timaru Boys' is offering support to boys and staff and working with George's family to help where it can.
"It is sad that such a promising young life has ended."