Ivan Lopez (Fort Hood shooting, 2014) – killed three and wounded at least 12 after opening fire at Fort Hood Army base in Killeen, Texas on April 2, 2014. Lopez, 34, was treated for depression, anxiety and sleep disturbances prior to the shooting. He was reportedly taking the sleep aid Ambien, as well as antidepressants. Lopez was also going through the process required to diagnose post-traumatic stress disorder but had not been officially diagnosed at the time of the shooting. http://www.cnn.com/2014/04/02/us/fort-hood-shooter-profile/