Anyone who we're already victimized by a scammer over the net?

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I don't know if I am already a VICTIM TO A SCAMMER but here goes my story/experience. While I was browsing my fb account over an andorid phone when out of nowhere came a message from a stranger. His message is that he is a deputy general manager of a bank and that he'd discovered that one of the account containing 4.5 million us dollars as he finished his audit and he's been put it into a suspended account since the owner of that account has been dead for 3 years now of a plane crash. I've asked him to present me proof about his claims (about the bank's name, bio info of the owner,his profile whom I can verify,etc.) and he sent me his international passport and called me several times (I gave him a cell number whose simcard I just bought earlier not my personal number so that anytime I sense something fishy so to speak I can just break the sim (-:) and he sounded sincere on his claims and even assured me that he'll be the one who will shoulder every expenses just to pull everythings off! He asked me if I can help him out to be an accomplice by pretending that I am an immediate kin of the said dead owner (of the 4.5 M account) at no risk or financial involve. I must admit that it's a very tempting offer that's very hard to resist. Now my question is: If you are in my situation, are you going to entertain his request or should investigate more?If ever you are in my shoe, what are the things that you must do so that you can say that it isn't just one of those INTERNET SCAMS? My last question is that if it is indeed a SCAM what legal actions should you take?