But actually in the movie you can hear Burke’s voice from Reagan: “Do you know what she did, your cunting daughter?”, referring to the fact she has killed him.
Correct me if I am wrong. Or do you mean it should have been more often in the movie?
It was many times in the novel, I believe. I think this would have been even more effective, using a voice that was known to be someone else in the film that the audience saw earlier who was now deceased.