PORTLAND, Ore. (AP) — A Portland man accused of killing his 73-year-old mother believed she was possessed by demons, records show.

Todd Carr, 54, pleaded not guilty Tuesday to second-degree murder in the death of his mother, Sharon Carr, who also went by Sharon Tate, The Oregonian/OregonLive reported. He remains held without bail in the Multnomah County Detention Center.

An officer found Sharon Carr dead July 5 inside an apartment she shared with her son and his wife.

Todd Carr told detectives he felt he had been attacked by demons for several days, according to a probable cause affidavit filed in Multnomah County Circuit Court. He encountered his mother upon returning to their apartment, the affidavit says, and thought she was possessed.

He told detectives he caused the injuries that killed his mother in order to survive and that he “disassembled the demon,” according to the court document.

The Oregon State Medical Examiner’s Office determined Sharon Carr, 73, died of blunt force trauma and homicidal violence.