What happens to Kenny "Killer" Kane?
The answer to your question is that Kenny “Killer” Kane is put back in jail. At the beginning of the book, we learn that Max lives with his “Grim and Gram” because his dad is incarcerated. At one point, Max is called into the principal’s office where he learns that his dad is going to be let out of jail on parole. This news makes Max fall into hysterics. (The news also causes Grim and Gram to consider having a gun in their house to keep the family safe.) Eventually, Kenny “Killer” Kane kidnaps Max on Christmas Eve and takes him to an abandoned building where Kane ties Max to a boiler. Loretta Lee unties Max while Kevin squirts Kane with “acid” from a squirt gun. As Max and Kevin run from Kenny “Killer” Kane as their dual character of “Freak the Mighty,” the two lead Kane out into the street where “a million cops” are waiting for him. The police take Kane back to jail. Max is safe and “Freak the Mighty strikes again!”