A 34-year old man has been arrested and charged with the murder of an autistic Christchurch boy.

Leon Michael leFleming Jayet-Cole died in hospital on Thursday night after suffering serious head injuries on Wednesday.

Today, police charged the 34-year-old man.

He will appear at Christchurch District Court tomorrow.

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Police said they could not confirm the identity of the charged man, citing legal reasons.

"Our investigation has led to the arrest of a man who is known to the victim," Detective Senior Sergeant Scott Anderson said.

"While the investigation will continue to focus on the events of May 27, 2015 we are also working with other government agencies to build a full picture of what has led to this tragic event."

A scene examination of a Papanui house was completed on Saturday evening.

Officers seized a number of items for forensic examination.

A post mortem was carried out on Friday.

Mr Anderson said police would "work tirelessly to ascertain why a 'normal' day for Leon ended as it did".