The crown says the combined strands of circumstantial evidence against double murder accused Chris Kahui proves he killed his twin baby sons and not the twins' mother Macsyna King who the defence have tried to blacken.
Crown prosecutor Simon Moore QC started the crown closing address today after more than five weeks of evidence, more than 1300 pages of evidence and more than 60 witnesses.
Mr Moore told the jury of seven men and five women at the High Court in Auckland that it would be understandable if they thought they would be "lost in a sea of detail" but the evidence against Kahui was clear.
Mr Moore said the crown did not dispute that Kahui's grief over the death of his sons was genuine and was no doubt deeply remorseful for his actions.
But Kahui was a young man under intense pressure, looking after three young children and worrying about his mother who was critically ill, he said.
Mr Moore said Kahui, left alone with the twins overnight for the first time, fatally injured his sons about 9.30pm on June 12, 2006 and then lied about it, blaming his toddler son instead.
"Kahui lost it and took out his pent out frustrations on the babies."
The jury had been bombared with evidence which painted a pretty damning picture of the mother of the twins, he said.
"If Macsyna wasn't there, she could not have done it."
The defence had gone to extreme lengths to blacken Ms King's character, but he said there was not too much to like.
Ms King had six children to three different fathers, abandoned two of them, had only visited her youngest child who is in care once since the twins death, had previous convictions and had used the drug P, he said.
"It's natural to feel some disgust at what you've heard."
However Mr Moore said the defence argument that Ms King was probably the person who inflicted the injuries on the twins after returning to the South Auckland house in the evening, was not realistic.
"There is no evidence that she was with or near the babies when they were fatally injured."
There was no evidence, not a single witness, to support the defence's theory that Ms King had returned to the home on the evening of June 12, he said.
Instead it was Kahui who was alone with the twins, and holding Cru, when he stopped breathing and required CPR about 9.30pm on the Monday.
Mr Moore accepted the crown case was circumstantial but said that did not make it an inferior case.
The twins were feeding and were normal when Ms King left the home that morning and no-one reported anything unusual with the twins until Cru stopped breathing, he said.
The defence theory that the twins may have already been fatally injured when Ms King left the house sometime before 1pm on June 12 was unbelieveable, he said.
Kahui said he fed the twins between 5pm and 6pm that day after April Saunders had also fed Cru about 1pm, shortly after Ms King had left the house, he said.
"No-one notices the fact these babies are fatally injured and have been since Macsyna left - that's what the defence would have you believe."
All of the crown expert medical witnesses testified the babies would not have been able to feed normally given the extent of their injuries, he said.
Kahui, in his videod police statements, had said the twins were normal and had fed normally, he said.
The medical experts all said it was likely the twins were hurt immediately before the CPR incident, he said.
Mr Moore also dismissed the defence theory Ms King had returned to the home on the Monday evening, while Kahui had briefly left the house, and hurt the babies in a "homicidal explosion".
The twins were killed by a young man who was resentful Ms King was away and he was left looking after the children, who he had doubts were biologically his.
Mr Moore's address continues tomorrow before lawyer Lorraine Smith gives the closing address for the defence.
