MASON CITY | An attorney for a Mason City man accused of killing his grandparents last November has filed documents seeking to change his plea of not guilty. 

Codie Matz, 25, was charged with two counts of first-degree murder for allegedly fatally stabbing his grandparents, Kenneth Hackbart, 61, and Kathleen Hackbart, 64, at their home in southwestern Mason City Nov. 7.  

Matz pleaded not guilty Nov. 28. On March 13, the defense filed a notice of defense stating that Matz “may rely on the defenses of insanity, intoxication, and/or diminished responsibility at trial in this matter.”

His trial was scheduled for October. On Tuesday, Matz’ court-appointed attorney, Parker Thirnbeck, filed a notice for intent to change plea.

“Defendant has reached an agreement with the State in this matter,” court documents said. “The Court is informed that the defendant intends to plead guilty in this matter."

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Matz is scheduled to appear in Cerro Gordo County District Court June 5 for the plea change hearing. 


On Feb. 8, Matz underwent a psychiatric competency evaluation at the Iowa Medical and Classification Center Forensic Psychiatric Hospital in Coralville. 

It was determined that Matz understood the charges against him and can assist in his own defense, according to the latest filing in the case.

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Contact Courtney at 641-421-0534 or on Twitter @CourtneyFiorini.



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