Carla stood just outside the line of yellow plastic ribbon that marked off the crime scene, straining for a better look. Inside the Lone Star barrier, two cruisers sat with lights flashing, illuminating the night with swaths of blue and red. Overhead, a surveillance drone took aerial pictures of the street, while on the sidewalk below it, plainclothes detectives bent over three bodies that had been covered with clear plastic sheeting to protect them from the drizzling rain. Other plainclothes officers combed the street, collecting shell casings and placing them in evidence bags.