Police recovered notebooks containing violent sketches and a 20-minute YouTube video referencing other mass shootings. Photo : AP Robin Westman, a transgender former student, committed a deadly shooting at Annunciation Catholic School in Minneapolis on August 27 during the school’s first Mass of the year, targeting children in what authorities called a premeditated attack. According to the investigation, Westman deliberately chose the date. “The school schedule is publicly posted online, so I should review it and look for significant events. Oooo August 27th—that is an all-school Mass,” Westman wrote in a July 25 journal entry, using a mix of Russian...