How did the hacker know the email attached to your account? Again, another simple mistake: you must always have the "Hide email address from public?" option checked in "Account Related Settings" so that no one can see the email address attached to your account when they check your public profile.
This!
It also got me wondering how some random chap out there who then got OP's formally expired email address figured out that he had an account registered on Bitcointalk and therefore hacked it as soon as possible. I do believe in coincidences but.....
Anyway, the ball is in the cryptios team's hands. I believe they will gather all the available evidence and make a verdict. Good Luck to OP.