The actor and activist, who portrayed icons such as Jackie Robinson and Thurgood Marshall, lost his private battle with colon cancer at the age of 43. REMEMBERING CHADWICK BOSEMAN: Robert Downey Jr. and more stars share memories of Chadwick Boseman: https://gma.abc/2YP9e7z 'Black Panther' star Chadwick Boseman talks importance of black superhero for younger generations: https://gma.abc/31KbbUQ 'Black Panther' director Ryan Coogler pens heartbreaking tribute to Chadwick Boseman: https://gma.abc/3gKqUar Subscribe to GMA's YouTube page: https://bit.ly/2Zq0dU5 Visit Good Morning America's homepage: https://www.goodmorningamerica.com/ #GMA #ChadwickBoseman #BlackPanther