The death certificate for Ben Affleck and Casey Affleck’s mother reveals new details about her cancer battle and final days following her death at age 83. Chris Affleck died from cardiopulmonary arrest, according to the certificate exclusively obtained by Us on Tuesday, July 28. News broke on Friday, July 24, that Ben, 53, and Casey’s mother died one month prior following a battle with pancreatic cancer. Related: Ben Affleck Through the Years: Teen Movies, Oscar Wins and More A Boston boy through and through. Following her death, Chris is survived by her sons, Ben and Casey, and her five grandchildren.