A New Zealand man who killed his mother and two siblings by repeatedly stabbing them has been found not guilty of murder due to unsoundness of mind.
Teancum Petersen-Crofts, 21, stood trial in the Western Australia Supreme Court accused of murdering his mother Michelle Petersen, 48, his sister Bella, 15, and half-brother Rua, 8, at their Perth home in July 2018.
Michelle Petersen suffered 54 wounds, while Bella and Rua were each stabbed more than 40 times, the court heard.
Bella was found alive in the backyard, but died soon after, while the bodies of Michelle and her son were found in a bedroom.
Petersen-Crofts admitted causing the wounds, but argued he was not criminally responsible because he was not of sound mind at the time of the killings.
On Monday, Chief Justice Peter Quinlan handed down his verdict, agreeing Petersen-Crofts should be found not guilty.
Chief Justice Quinlan said Petersen-Crofts was suffering from a mental illness at the time.
“In particular, I find you were suffering from schizophrenia,” he said.
“You were deprived of the capacity to know that you ought not do those acts.
“You believed that your actions, as horrifying as they were, were the right thing to do.”
Chief Justice Quinlan said “we can and we must” do better at assisting people who suffer from a serious mental illness.
“We, the whole community, have failed you and we failed your mum and your sister and your brother, and we failed your grandmother and the rest of your family whose loss is indescribable,” he said.
The court heard Petersen-Crofts’ history of mental illness dated back to his mid-teens.
The trial only heard from mental health experts.
Petersen-Crofts sat in the dock with a support worker, while other members of his family sat in the public gallery.
He will be detained in a mental health hospital.
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