Music News Slits member Arianna Forster dead following an undisclosed illness 10/22/2010 Arianna Forster, a German-born punk rocker known as Ari-Up, has died following an undisclosed illness, her stepfather John Lydon's Web site said. Read More RELATED NEWS Jimmy Fallon's 'The Tonight Show' dropping to only four nights a weekAshley Tisdale announces birth of her second childSelena Gomez is a billionaire TAGS: