August 16, 1977
Shortly after midnight Elvis returns to Graceland from a late-night visit to the dentist. Through the early morning of the 16th he takes care of last minute tour details and relaxes with family and staff. He is to fly to Portland, Maine that night and do a show there on the 17th, then continue the scheduled tour. He retires to his master suite at Graceland around 7:00 AM to rest for his evening flight. By late morning, Elvis Presley is dead of heart failure. It is announced by mid-afternoon. In a matter of hours the shock registers around the world.

As taken from www.elvis.com

I think you should either inform them, or go see an optician if you think you have seen him recently

So how come his credit cards were still being used years after his alleged death

You never heard of card cloning?

Nope