Pop star Jacky Cheung Hok-yau was taken ill during the musical Snow Wolf Lake at the Hong Kong Coliseum last night. The show, part of a run ending on May 9, had to be cancelled. Cheung told the audience he had flu and was feeling unwell. 'Jacky finished the first song and returned backstage,' a spokesman for the organiser said. He was sent home after being treated by a doctor. The musical also stars Sandy Lam Yik-lin.