Chris Kahui killed his twins sons while he was under intense pressure from being left to look after them alone for the first time, a jury in the High Court in Auckland was told today.
"Kahui lost it and took out his pent up frustrations on the babies," crown prosecutor Simon Moore said in his closing address at the High Court in Auckland.
Kahui has denied murdering his three-month-old sons Chris and Cru in June 2006.
Mr Moore told the jurors that he understood that for the past five weeks they may have been wondering if the twins' mother Macsyna King really did it.
They had been bombarded with evidence which painted a pretty damning picture of her.
But if "Macsyna wasn't there, she could not have done it," he said.
Mr Moore said when Ms King left the twins during the day on June 12 2006, the twins were well.
"There wasn't anything wrong with them, every witness says that."
There was not one piece of evidence that said the twins were injured by the time Ms King left the house, he said.
"Twenty-two hours later when she returned the babies were fatally injured."
Mr Moore said when Ms King asked Kahui what had happened to the twins he replied "you should have been here".
"He knew full well that she was not there."
Kahui was a young man under intense pressure, looking after three young children and worrying about his mother who was critically ill.
It was the first time Kahui had been left with the twins overnight and "he was not coping".
The twins were killed by a young man who was not coping and was resentful, Mr Moore said.
Ms King was away and he was left looking after the children.
Mr Moore said the crown believed the fatal injuries were "likely" to have happened just before the CPR incident on Cru about 9.30pm on June 12.
The crown did not have to prove that this was the timing of the fatal injuries but medical witnesses had testified this was the most likely scenario.
