One of us is lying

The strict teacher in punishment left five high school students in the classroom after lessons, but only four came out of there alive.
Fifth, Simon, a school outcast, brutally avenging its offenders on the Internet, revealing their most unsightly secrets - was found dead. The police have no doubt that this is a murder. Everyone is suspicious, because everyone has something to hide.
But which of the four boys and girls is a killer? schools, a blonde from shampoo advertising?
Nate - a young criminal located on a trial?
Cooper - an upward baseball star with the face and figure of Captain America, the idol of the girls?
each of them had their own Reasons to get rid of Simon. But who went to the crime?