The sound I most associate with death is silence. Not just the obvious one, in that the dearly departed will never speak, never yell, never cry, never laugh again.
Smaller silences, like post-funeral, when the last guest is gone and all you’re left with are your thoughts and an inordinate amount of food shared by well-wishers. Or when weeks have passed and you go to call or text them about your day before you stop yourself because you can’t do that any more.