A young Colorado woman was struck and killed by a rock somebody hurled through her windshield as she was driving home through a tony Denver suburb on Wednesday night — which authorities are investigating as part of a disturbing pattern. Arvada resident Alexa Bartell, 20, was returning from work around 10:45 p.m. when the large rock sailed through her windowshield and hit her. Bartell had been on the phone with a friend when the line suddenly went silent. The pal tracked her down using her phone’s location, where she discovered Bartell’s car run off the road in a field with...