Why didn't Andrew go to jail after killing 15 people?

Without specific details about the case involving Andrew, it's difficult to provide a precise answer. However, potential reasons could include a lack of evidence proving his guilt, a successful legal defense that established self-defense or insanity, or a plea bargain that resulted in a lesser charge. Additionally, if he was deemed incompetent to stand trial or if the legal system faced procedural issues, these factors could also contribute to him avoiding jail time.