Home U.S Paul Ritter, actor in 'Chernobyl,' 'Harry Potter,' 'Friday Night Dinner,' dies at... U.S Paul Ritter, actor in 'Chernobyl,' 'Harry Potter,' 'Friday Night Dinner,' dies at 54 By nytimespost - April 6, 2021 0 Paul Ritter, a Tony-nominated actor who appeared in “Chernobyl” and “Harry Potter and the Half-Blood Prince,” died at 54 from a brain tumor.