Prosecutors will concede Cy Walsh was mentally incompetent when he allegedly killed his father, former Adelaide Crows coach Phil Walsh.
The 27-year-old has pleaded not guilty to the stabbing murder of his father at the family home in Adelaide on July 3, 2015.
He faced the Supreme Court via videolink from prison on Friday, clean-shaven and wearing a green jumper.
Prosecutor Lucy Boord told the hearing the Director of Public Prosecutions will concede Walsh was mentally incompetent when he allegedly killed his father.
She said the DPP would make similar concessions to the objective elements of the case when the court reconvenes for a half-day hearing on September 28.
More to come