Not even Michael J. Fox knew Robin Williams had been diagnosed with Parkinson's disease.
Fox, who's become the public face of the disease, took to Twitter on Thursday after it had been revealed that Williams was struggling with the early stages of Parkinson's. Williams, who had been open about his issues with depression and addiction, was found dead on Monday after hanging himself in his northern California home.
Williams was a philanthropist who gave his time to numerous organizations such as the USO and St. Jude Children's Research Hospital. He also supported The Michael J. Fox Foundation. The two friends — who both got their start on TV sitcoms (Mork and Mindy for Williams and Family Ties for Fox) — were photographed together (see photo above) at a 2004 benefit for Parkinson's research. Video and full story