Not to mention, Solomon had a film, his was tied with another students film. Amys father was the deciding judge and he favored the other student. He wanted to frame Amy for the crimes.

The killer was Professor Solomon.
He had lost the Hitchcock award when he was a student so he was stuck being a teacher. When he saw that Travis had made a brilliant student film, he saw his ticket out; he wanted to take credit for it.
He murdered Travis and made it look like a suicide, then used Amy's Urban Legend film to kill everyone who worked on Travis' movie, framing her in the process.

Professor Solomon.
I forgot why (and only remembered the character's name because I looked up the actor and which part he played) because I only watched it once and it's been awhile. It wasn't a very memorable movie.