"The death of any person is a tragic event, but when it is an infant as young as 4-weeks-old it is simply senseless," Schmid said.
"Maree suffered traumatic injuries before her death. Her passing greatly impacted the people of Kaitaia and I would like to acknowledge the community for their support in our investigation."
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Schmid said the community, like police, have no tolerance for harm inflicted on our tamariki.
"Finally, I would like to acknowledge the Operation Nycteus team who worked diligently to bring justice for Maree,'' he said.
"Many of the staff on this investigation team have children of their own and I recognise their professionalism in bringing this matter to the court."
At the start of Friday's sentencing an emotional harm statement was read on behalf of Maree's mother Kirishia Kitiseni and her whānau that outlined the deep grief felt over the baby's tragic death.
She said she would never get over the hurt and anxiety from Maree's death, but was consoled somewhat by the knowledge that her daughter was now being looked after by her two late brothers.
Kitiseni said the tragic death of her baby and associated pain was something she would have to live with every day.