As far as I know there has been no proof offered that the student received any death threats. Has he produced any of these Emails, recorded any the calls? I am starting to doubt his tales.
Not only that but without a forensic investigation of his computer to see which domains the alleged death threats came from and he, himself or any of his friends are ruled out, any death threat would be suspect.
I could send myself any number of emails saying whatever I want and signing it however I want. An email is proof of nothing.