There have been at least 180 shootings since the Orlando massacre on Sunday. Five of those shootings were considered mass shootings, when at least four people were shot in a single incident. One of those mass shootings was right here in California on Tuesday. A gunman opened fire on a vigil for two drowning victims. A 17-year-old girl was killed in that shooting. Three other people were injured. As we take a closer look at gun violence and how to prevent it, we ask about the killings that don't captivate the entire nation.