article_snippet: When I first heard that, I was somewhat shocked," Birkbeck told CNN, "and a little disturbed.
article_snippet: For viewers of the HBO documentary, that might not come as a surprise.
article_snippet: CNN's Evan Perez, Chandler Friedman, Jeremy Grisham, Dave Alsup, Holly Yan, Chris Welch, Shimon Prokupecz and Kevin Conlon contributed to this report.