School-related problems such as poor academic performance, truancy, frequent suspensions, and grade repeating have been identified as risk factors for adolescent behavior problems. The purpose of the current study was to examine the effect of school-related factors on violent criminality in adulthood, based on data from the National Longitudinal Study on Adolescent Health. Logistic regression analyses indicated that behavioral variables (i.e., truancy, suspensions) and academic variables (i.e., grade retention and grades) significantly improved the prediction of criminal offending. The strongest predictor of violent criminal behavior in adulthood was repeating a grade at the secondary level. Practice implications are presented. (Contains 1 table.)