Matt has been shot by Tyler but because he can't walk and is wounded he can't be treated first and is probably going to die. Claire, his sister, is on the phone with him talking to him for probably the last time ever.
Once on the second floor Tyler hunts down the four of them and shoots Tomas. When Autumn sees her brother kill her friend she runs out and throws her arms around him in a hope to make sure he knows he was loved and will be remembered.
As soon as Sylv comes out to her brother Tyler turns the gun to himself and shoots his head. After everything he has done and been through he thinks no life is better than a life in jail.
The last part of the book is how many of the students who made it through the horrific event come out late in the middle of the night one year after the tragedy and let a lantern go for each one of the students or teachers that died because of a gun.