He said the school started back for the year on Tuesday.
"That's the biggest shock for us at the moment — to know he was here yesterday and to hear the news today that he won't be with us anymore."
Marchioni said the student was well-liked around the school.
"He was full of energy, excelled in sports and had a big heart."
"It's a very sad day for the students and staff today. It's a big loss and quite raw at the moment."
"We're also thinking about the family and what they must be going through."
He said the student had been at Kihikihi Primary School for six months, prior to that he was at Wharepapa South School.
"It's school as normal today. Some of the students are quite upset but we're all managing as best we can."
Kihikihi Primary School was receiving support from the Ministry of Education.