You may want to slow down for a moment. From what you've said, he's sent you death threats, claiming he's going to Self Delete, and going at Badspot etc
You probably want to unfriend him from anywhere possible, Steam, some version of RTB if that's what you're using, and all since he's harassing you.
Normally, in drama, you would supply the target's BL_ID and screenshots if possible.
I also seriously doubt he's old enough to drive, much less travel anywhere on his own. I would say he's simply having a fit. What type of condition would cause him to act like this?