Why is mr kellerman know a killer man?

Mr. Kellerman is labeled a "killer man" due to his involvement in violent acts or criminal behavior that has led to the loss of life. This reputation is often solidified by his actions or decisions that demonstrate a disregard for human life. Additionally, the perception may be influenced by public opinion, media portrayal, or the consequences of his past actions. Ultimately, his actions have created a lasting image of him as a dangerous individual.