When they got back to the apartment, Brittany Rubke was allegedly black and blue. Cassie Herrera knew her big sister wasn't breathing. Herrera pulled Rubke off the couch and started CPR."I found my sister on the couch and she wasn't breathing and she was already black and blue," Herrera testified in Justice Court Friday afternoon.Angel Altamirano, 21, whom Rubke was living with, is charged with second-degree murder in the alleged overdose death of Brittany Rubke who was 23 at the time.Altamirano, of Carson City, was bound over to district court by Judge John Tatro during a preliminary hearing.According to Nevada …