Best way to deal with this is to ignore it, or you can dox yourself because no one really cares what your name is. Also, it probably isn't a crime to post someone's name. If he made a violent threat then you are file a police report by taking the evidence with time stamps and IP addresses to the local police department.

He knows it gets you riled up and makes you post things like this, so that's the only reason online trolls do this kind of thing. Ignore them, and they get bored after about 1 time.