Worksafe New Zealand will not be taking any legal action against Taradale Primary School for the tragic death of Aryan Banerjee in May.
The investigation into the incident has now finished and Worksafe found the circumstances which caused the nine-year-old's death were "not reasonably foreseeable, and no charges were legally justified".
Aryan died in hospital in September, more than three months after he was strangled when his clothing caught on a window latch handle as he tried to climb out of the toilet near his classroom.
He had found himself stuck in the toilet unable to open the door, which was being repaired and had been left unattended without a door handle.
WorkSafe's chief inspector, Keith Stewart, said Aryan's death was a terrible tragedy for his family, the school and the wider Taradale community.