Quote from @Theresa Harris:
Then talk to him and tell him you are concerned. you could tell him if the police are coming over (in his mind-but leave that part out), perhaps he would rather live in another place that is a better fit for him.
Assuming what you've posted is true, this person is seriously mentally unstable. You need to either get rid of him ASAP somehow (lease violation or speak to his emergency contact/family member) or get out of there yourself. No amount of money is worth you and your wife's safety. Severe all contact immediately.
I quoted that part above as confronting him directly and saying you're concerned about is behavior is HORRIBLE advice. He's obviously not all there and you put a target on yours and your wife's back by openly acknowledging his behavior. For the love of everything do not do this. Not one good thing will come by you bringing it up to him. Whether or not you are trying to play into his games is irrelevant.
Think about this. He's obviously paranoid about someone coming to get him. And you tell him he's scaring you and your wife and to knock it off? Don't play into his delusions. Ignore all communications and work to get him out or move yourself. People who act like this are insanely unpredictable.