Cy Walsh has been found not guilty of murdering his father and former Adelaide Crows coach Phil Walsh by reason of mental incompetence.

Cy pleaded not guilty to the murder of his father with Justice Ann Bampton formally making the ruling on Wednesday that the 27-year-old was not guilty of murder due to his mental state at the time.

"I find he was suffering from a psychotic episode as a result of schizophrenia, which at the time of the conduct was undiagnosed," Justice Bampton said.

What it means is that the court was satisfied that Cy killed his father, however, also concluded that he is not criminally responsible for the crime due to his mental incompetence.

As a result, he will not face jail time, but instead will spend the remainder of his life under what is called a limiting term.

A limiting term is a court imposed period under mental health supervision that is equivalent to the jail term that a mentally well person would have received.

However, there is still a possibility that he may be released later in life if it is deemed acceptable by a doctor. If that occurs he would be released under supervision with continued treatment.

A statement prepared by Phil's wife, and Cy's mother, Meredith, was read to the court following the decision.

"My heart remains broken. My daughter is also shattered," she said.

"We now all live the devastating consequences of a mental illness that was not understood.

"I will continue to love and support my son as his father has always done."

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