BURLINGTON, Iowa (AP) — Attorneys for a Burlington man accused of using an electric guitar to kill his mother say he’ll use an insanity defense if he goes on trial. The defense notice was filed Monday in Des Moines County District Court for 30-year-old Garret Selters, who’s charged with first-degree murder in the Oct. 17 slaying of 56-year-old Linda Selters. Authorities say he swung the guitar into the back of her head. Police say Linda Selters had called for help that day, saying her son was having an “episode.”

Officers found Garret Selters outside, pacing and stating that he’d killed his mother. So far doctors have concluded Selters is incompetent for trial but is being treated in hopes of restoring his mental competency. A hearing on the issue is set for April 23.