Old Lady Killer and Dead Bodies at Tables

I remember watching this movie on DVD back around 2011-2012 ish, but the movie itself came out earlier (before 2010 I think). The only clear scene I remember is the ending.

The ending happens when this guy (I believe he was a police man possibly) shows up at this old lady’s house. He knocks on the door but doesn’t get an answer. He goes into the house and opens another door. Inside this room is a bunch of dead people all dressed up and sitting at tables. The room is old and dusty.

From what I recall of the plot, a bunch of townspeople had went missing. Through the entire film, you see the old lady (who turns out to be the killer) who plays off as a sweet, harmless grandma.

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