Domestic terrorism charges were filed against a Portland high school student on October 2 after investigators determined the September 8 release of hydrogen sulfide and hydrogen cyanide in the school cafeteria was intentional, with 19 total felony counts including 12 charges of attempted murder.

Jesse Lee Calhoun was indicted September 16 in a sixth killing dating to November 2022, extending his established timeline back before the five Portland-area murders that first drew public attention, with the victim's remains still not recovered.