Two wonderful writers died yesterday in New York. Influential Australian art critic and writer Robert Hughes (left) passed away at the age of 74. Hughes, who was known for books such as “The Fatal Shore” and “Shock of the New,” died in hospital in the Bronx after a long illness. And Mark O’Donnell (right), the Tony Award-winning cowriter of the smash Broadway show “Hairspray,” died Monday. He was 58. The writer collapsed in the lobby of his apartment complex on the Upper West Side of Manhattan. His building was not far from mine, and I would occasionally see O’Donnell roaming happily around the neighborhood.