I called the police and went to the police several times with my exABF. He tried to threaten my life and showed up at my work.
I was afraid, and I understand that you are too. But the only response is continuing to call the police and not talking to him or his family. Even a restraining order is no guarantee he will stop. If it's legal in your state, maybe consider pepper spray. He's dangerous. The less contact you have the better. I didn't answer my door when he showed up and I didn't take his calls. Really, do not talk to him at all, that just gives him power (in his mind.)