I have seen the same case on the forum just a couple of days back. I can't recall the thread but the story was similar to you. Most probably someone from your known person trying to blackmail you to gain some BTC. Even hackers story is true but there are no benefits if you send funds, because the hacker will blackmail you always when he will need money. So let them do whatever he can do by ignoring this mail and you may file a case in your local country. So that the cyber department of your country would take action. I believe, if the scammer really had your device access then you would hack your BTC as well, then he shouldn't have written you via email.
This one:
Email scam. Or the OP's email has been leaked that's why he received this kind of email. The first thing to do is ignore it and ditch that old email or yours.
Other peoples should take a lesson from here. Your pc should keep clean always and you should have confidence that your devices aren't hacked. Especially we are crypto users and we should be more careful than others.
Update your OS, installed anti-virus and always think twice before clicking any link. Hackers and criminals are everywhere so we really need to have a good security practice so that we won't fall for this trick.