A 17-year-old in Acton, Massachusetts, was charged with two counts of murder after his 45-year-old mother and 14-year-old brother were found dead at home on August 11, 2026; a not guilty plea was entered. Middlesex District Attorney Marian Ryan said he had used the internet and ChatGPT to search for 'theoretical ideas or fantasy stories regarding the killing of his family.' The charges have not been proven and no motive has been given.