I realize now that my sister's death was an accident. I do not blame your brother. I feel only sympathy for him.

10 seconds sound clip from the The Pit and the Pendulum (1961) movie soundboard.

You can hear this line at 00:52:18 in the Blu-ray version of the movie.

Quote context

[...]

- What is it, Mr. Barnard?

- May I speak with you?

- Certainly.

- I came to apologize.

- Apologize? But everything you said...

- I know that my suspicions were justified, but not as I had expected.

- I realize now that my sister's death was an accident. I do not blame your brother. I feel only sympathy for him.

- What I did was, I assure you, only because of Elizabeth.

- I think I understand.

(Thunder)

- I'm sorry that our meeting should have taken place under such unhappy circumstances. Had things been otherwise...

[...]