Warning: Full spoilers for the May 31st Person of Interest, “The Day The World Went Away,” below. The 100th episode of Person of Interest was a huge – and hugely sad – one, as Root (Amy Acker) was killed protecting Finch (Michael Emerson). But with just three episodes left, it was also clear this wasn’t the end for Acker on the series, as the Machine, which Root worked so hard to help, took on her voice and persona, becoming more of a full character than ever before. I spoke to Acker about this big turn of events, when she found out and what she felt about Root’s fate.