"I was able to ask her as many questions as I possibly could,” said Grace Van Patten of preparing to portray Amanda Knox. "She was extremely open with me."

"The Twisted Tale of Amanda Knox" star Grace Van Patten breaks down the "psychological nightmare" that led to Knox's "tragic" coerced confession

Van Patten tells PEOPLE she remembers worrying, "What would [Knox] think of me, this random actress portraying her in a very traumatic time of her life?"