ExtrEmE violence between students in high schools may hinder students from learning efficiently. Deadly school shootings have a potentially large effect on students and schools. These incidents can affect students' decision about whether to stay at their school, affect their cognitive skills, and influence their behavior at school. Despite the fact that school shootings receive widespread media attention, the educational consequences of deadly school shootings on enrollment and student performance are not well known.We address three questions related to the consequences of homicidal and suicidal high school shootings. First, we address whether enrollment patterns change after shootings, which would likely be the result of school selection by students and parents, or students dropping out of the school system in response to the shooting. Second, we examine whether deadly shootings lower test scores in schools in subsequent years, which helps to establish medium-term trauma effects. Third, we look at the effects of deadly shootings on a range of behavioral variables such as graduation, attendance, and suspension rates.We estimate the impact of deadly high school shootings by using a difference-in-differences strategy, comparing schools that had fatal shootings with other high schools in the same district that did not experience such shootings. To estimate this, we merge an existing database of fatal shootings with the high-school-level Common Core of Data (CCD) and school report cards to form a panel of schools. Because we compare schools within the same district, our comparison group exhibits an environment similar to our group of interest aside from the turmoil generated by the shooting. Our empirical strategy relies on the assumption that these deadly school shooting incidents are exogenous in their timing.We find that enrollment in Grade 9 (the high school entrance grade) drops following a deadly shooting, though we do not observe enrollment