What is the climax of this story?
The climax, the most intense part of any story, is called the turning point because it determines how the main conflict will be resolved. Steve's main conflict is his internal struggle of deciding whether or not he really is a "monster". He writes that he is "so scared. My heart is beating like crazy and I am having breathing trouble." On the other hand, Steve is a liar because he was near the store on the day of the murder. He's also hurt his family. Steve says of his mother, "In a way I think she was mourning me as if I were dead." His father doesn't know who Steve is any more. These are the conflicts Steve has within him to decide whether he has become the "monster" he's been portrayed as.
When do we know the outcome of this internal struggle Steve has? I believe it's after he's found innocent and discovers that he still has to pay a price for his behavior. That price is his image in other people's eyes and in Steve's own eyes. Steve thought being acquitted would allow him to go on with his life, but he learns that isn't the case. He thinks he "looks like one of the pictures they use for psychological testing, or some strange beast, a monster." In the end, Steve has to decide if he can overcome his image of himself and in other's eyes, or if he will always be a "monster".