As Justice Anderson said in her summing up of the case on Tuesday morning, this was a trial by jury, not a trial by experts.
There were also some differences in opinion between key medical experts, the judge said.
Forensic pathologist Dr Simon Stables, who conducted Amaziah’s autopsy, said he had suffered a subdural haematoma, a build-up of blood between the brain and its outermost covering, or dura.
Between the dura and the brain’s surface were small and fragile blood vessels, Stables explained.
When a head came down suddenly on a surface, the brain lagged behind the skull and caused those vessels to snap like chewing gum suddenly stretched.
Crown prosecutor Luke Radich asked Stables if a child could suffer a head injury like Amaziah’s from a short fall, as suggested by Te Ahuru’s lawyer Kelly-Ann Stoikoff.
“It can happen, but it’s incredibly rare,” the pathologist said.
The prosecution case is Te Ahuru forcibly struck his son or smashed him into another object because the head injury was too severe to have been caused by a fall alone.
Paediatrician Dr Patrick Kelly was more definitive, saying there was “no other reasonable possibility” than Amaziah’s injuries being the result of abusive head trauma.
The defence case was that the possibility could not be ruled out that the injuries were caused by Te Ahuru accidentally dropping his son.
Stoikoff, in her closing address, explained her client’s inconsistent and evolving accounts of what happened across several police interviews as a very human reaction of someone in a stressful situation trying to protect themselves and their family.
She said there was enough uncertainty in the medical evidence and over what happened in the bedroom and what was going through Te Ahuru’s head to ensure that the high standard required for guilt in criminal prosecutions – beyond reasonable doubt – could not be met.
“You simply can’t be sure,” she told the jury.
Radich, in his opening address, said the trial was about what happened in the half an hour in which Te Ahuru, agitated and impatient, was alone with Amaziah.
Richards needed to leave the cramped unit in Reagan Rd, Manukau, to do some washing at a laundromat a short drive away.
Both parents were unemployed and there were two other children under 5 from her previous relationship living in the home.
The prosecutor said the comments did not gel with Te Ahuru’s account of what happened.
“This is a curious way to phrase things if what happened to Amaziah was an accident rather than abuse.”
He told the jury their role was not to sociologically analyse the couple’s grim circumstances but to look at the evidence.
It all pointed to Te Ahuru losing his cool and doing the unthinkable, he said.
“It’s the grim reality, but it is the reality.”
George Block is an Auckland-based reporter with a focus on police, the courts, prisons and defence. He joined the Herald in 2022 and has previously worked at Stuff in Auckland and the Otago Daily Times in Dunedin.