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 falls under suspicion, because everyone has something to hide.
But which of the four youths and girls is a killer?
Bronwin - a round excellent student entering the ivy League?
Eddie is the first beauty Schools, blonde from shampoo advertising?
Nate - a young criminal located on a trial?
Each of them had their own reasons to get rid of Simon. But who went to the crime?