UPDATED 2.41pm A Coroner's hearing into the death of a Napier school boy who was accidentally strangled on a toilet window has heard there was no handle on the door.

LISTEN ABOVE: Newstalk ZB Hawke's Bay reporter Annette Hilton spoke to Chris Lynch

Nine-year-old Aryan Banerjee died from critical head injuries in September last year.

He was strangled after his shirt collar got caught on a window which he climbed out because the door jammed.

Coroner Tim Scott has heard the door handle was left on the ground in front of the toilet, while it was being repaired.

A staff member says door was not taped off to stop children from using the toilet, because it should have been a quick fix.

Staff members are today giving evidence today at the Coroner's hearing.

Coroner Tim Scott will today look at the actions of key staff members involved in the incident and what school procedures have been changed as a result of the death.

The police officer in charge of the investigation, Detective Sergeant Heath Jones has described to Coroner Tim Scott what happened.

He said Aryan was found hanging by the window about two feet from the ground by other students.

The Banerjee family lawyer, Nigel Hampton QC questioned school principal Marty Hantz over why the caretaker didn't tell the teacher that children shouldn't use the toilet.

Mr Hanz said it wasn't acceptable that the caretaker didn't warn anyone about the door.

The school's caretaker has told the Coroner's hearing that he didn't want to leave the repairs until after-school.

He said he was focused on getting it done as quickly as possible.

WorkSafe New Zealand decided last November to take no legal action against the school or its staff members.

Five people are scheduled to give evidence today at the hearing including the police officer in charge of the investigation, school staff members and a representative from WorkSafe New Zealand.