Pretty Little Liars Star: A New "A" Suspect Arises in Halloween Prequel

Pretty Little Liars star Sasha Pieterse has two words of advice for viewers watching the Halloween episode: Pay attention.

"It amplifies evidence and also a new suspect arises," Pieterse says. "This person is someone you haven't really thought of before, or if you have, there's not much evidence to back it up."


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