A lone gunman killed 20 children and 6 adults including himself at a Connecticut) School He used guns registered to his mother. The emergence of ASD and PTSD Acute Stress Disorder and/ Post Traumatic Stress Disorder) were identified as happening after a major incident such as this one. The symptoms that can be present in this situation were reviewed as well as some possible long term effects. The grieving process was also discussed. In the aftermath of such situations, attention is often focused on people with mental illness who might have the potential do do violence and/or commit a copycat crime even though in retrospect this is very small proportion of the population.The gun control issue and related psychological factors were also discussed.