I know from dealing with my father’s estate that it was rather painful to get letters addressed directly to him. I don’t think you’ld want to ailienate the survivors. It would probably be better to address the PR, or if there’s just one survivor (ie. widow) directly to that person.
Once when I published a college newsletter, I got a rather snotty letter from an alumus’s widow because he was still on the mailing list. basically, “I can’t come to homecoming because I’m dead”.