HIGHLANDS RANCH, Colo. (AP) — Two high school students, one of them a juvenile girl, shot and killed a classmate and injured eight others at a charter school in a Colorado community that marked the 20th anniversary of one of the nation's worst school shootings just weeks ago.Douglas County sheriff's officials said Devon Erickson, 18, and a younger student walked into the STEM School Highlands Ranch Tuesday afternoon and opened fire on students in two classrooms, prompting [...]