Any ideas on what could be wrong with my car? - 1

I own a 2008 Honda Civic. When I returned home after driving around for a while I turned my car off but once outside of the car it sounded as though it was still running. I tried turning my car on and turning it back off, but the sound continued. I left it thinking it would be okay. The next night I tried turning my car on it is completely dead. Any help on what it could be?

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