My friend is a paedophile

I found out a friend of mine of ten years is a pedophile and dating a fifteen year old kid. I confronted him about it and now he's starting and drama and telling everyone I'm making all this up and now I'm worried he's going to send people after me. I don't know what to do. The good person in me is telling me to turn him in because I have seen him with my own two eyes kissing the girl on the mouth, he has admitted he is dating her, and I have caught them exchanging disturbing and explicit text messages, where she is sending pictures of him in her bra and panties. The worse thing is she lives in the apartment behind him, and I have stumbled upon old photo archives of nude girls who looked like they were at least twelve to thirteen years old. Idk what to do and how to go about this without being killed. Help me!

I take it that you do not trust your local police department to protect you if you report him? I'm also not sure why you would feel your friend would turn into a violent killer suddenly, even despite this news. Why are you fearful that he will have you killed? Is he powerful in that way? Have you received any threats? Does he have a violent history? The absolute right thing to do is tell authorities and/or this girls parents. It looks like you have already told others though. Do they not believe it with that being the reason they too haven't reported it? Or are they scared of him too?

No I don't trust the pd to keep me safe if I turn him in. No I have not told anyone.. The only person I confronted was him, and he got his mother involved and a few other people trying to say I'm making it up and nothing is going on. And yes he has threatened me and my boyfriend and told us we would be in a pine box if word went around about it and his mom is a biker whore and claims she is a mongol and can get any mongol after anyone if she wants. That's why I am in fear of my life. The guy has psychopathic tendencies because how he was raised and has a relationship with his mother the exact same way as Owen and his mother from throw momma from the train. So yeah I'm somewhat afraid of the possibilities of what he will do. I understand he's lonely and nobody's is really interested in him but he shouldn't get with a fifteen year old and he's 26 . It's wrong.