I saw a murder. One of my classmates killed another student.And I made a tragic mistake. I didn't tell anyone right away. I didn't tell my mom. I didn't tell any of my teachers. I didn't even tell the police. I was so scared that I kept it to myself. By the time I got the courage to say something, no one believed me.Only one person believes me. And he's the one who killed her. If I could go back and change anything, it would be that I would have told...