psycho ex still contacting me after 6 years...help, i'm scared.

I need advice on what to do. Long story short:

I dated this guy when I was high school, we dated for two years. I moved away after high school and we broke up.
When we broke up he immediately began stalking my home, calling my phone non-stop, all hours of the day. Would send me pictures of his arm slit up by razors and hit me with his car in the middle of traffic after he caught me leaving my house and was stalking me.

Now 6 years later: He still sends me aggressive and crazy emails,making new Facebook accounts every other day, the emails are scary and possessive. He believes that I am his soul mate, that he can't live without me and that "I made the biggest mistake by leaving him" He is delusional and thinks that I am still in love with him, even though I've told him he is fucking crazy and I'm seriously afraid of him.

The past couple of months I've been having dreams that he is coming to find me and hiding in my home. two of the dreams have involved guns. Last night I dreamt that he was hiding in my car and he shot me in the face when I got in the vehicle.

Now question is: DO you guys think this is the kind of person that would kill someone? I feel like he is a socio-path, delusional, and has mental issues. I'm worried that if he got the chance to find me and where I live that he would hurt me, what do you guys think? I need advice.

He has been on anti-depression meds since 14. Don't write him off as some "emo guy" though. You have to understand, it was a stupid high school relationship and 6 years ago. The emails get more aggressive and possessive each time and I never reply!!!

Also crazy/weird thing about him: I once found, 6 years ago, a box under his bed that had printed out pictures (pictures on a piece of printer paper) of my older sisters and and of girls in his grade and my grade. the pictures were from their myspaces and really grainy, not glossy like an actual picture, i mean these were on paper!??? it was so freaky and weird.

Ive gone to the police before and they never seem to care until something actually happens. Honestly if he ever came near me, I would have no problem using "self defense" if you know what I mean, he scares me that much. I moved all the way to Oregon (job opportunity) but luckily after he found out that I was living in Texas.

I know this may sound stupid, but i'm becoming paranoid, something doesn't feel right and I need advice on how to handle this situation. There was always this crazy demonic look in his eyes and I wouldn't be surprised if he actually was insane enough to come find me. This is more of a mental crazy, rather than a physically abusive person, at least not form what I experience. I don't know if that makes a difference, I guess I'm trying to ask what you guys think are the characteristics of someone who would seriously hurt someone else.