Mostyn
Do you really need to know the identity of the celebrities if the answer revealed by completing the crossword is "buried twice"?
There is a suggestion that Chaplin was dug up for re-burial because he was a Jew buried in a gentile cemetery and, presumably, the other guy, whoever he is suffered the same fate. So, whilst it would be comforting to know that was the case, I do believe that the answer to the puzzle is contained within the shaded baxes i.e, "buried twice"
TomTom