The two lines from Edgar Allan Poe's "The Black Cat" that prove true that the narrator is in jail awaiting his execution for the cold-blooded murder of his wife because he was attempting to kill the second black cat are as follows:
1. The narrator stated in the first paragraph that "Tomorrow I die ..." while he was using today to unburden his soul by writing down his confessions. The confessions explain the reasons that pushed him to murder his wife.
2. This unnamed narrator in the final paragraph also mentioned that the black cat's "informing voice has consigned me to the hangman."
Thus, the first line shows that the narrator is in jail. The mention of a "hangman" in the second line shows that he is awaiting his execution for the murder of his wife.
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