Transcript for Knox: Trial Was Like Crawling Through 'Barbed Wire'
Now to diane sawyer's exclusive interview with amanda knox. The young american woman at the center of an italian murder mystery that became a global sensation convicted in a 2007 murder of her roommate. Amanda spent four years in an italian prison ban appeals court set her free. Today she releases her memoir "waiting to be heard." And our good friend diane always good to see you. Great to see you in the morning. We have been waiting to hear from her. You spent a lot of time with amanda. What were your impressions? You know, you and I have been talking. There are some interviews you want to make sure every single person watching gets to look at her face, look in her eyes and make up their own mind about her. She was in prison, 1,400 nights fighting this for six years and she just learned right before this interview she just learned that another italian court says she has to start it all over again, so every word she was saying could affect her freedom. Here's what she said of the blow of that decision. What was your reaction when you heard the supreme court decision? It was incredibly painful. I felt like after crawling through a field of barbed wire and finally reaching what i thought was the end, it just turned out that it was the horizon and I had another field of barbed wire that I had ahead of me to crawl through. Wow. She came back october of 2011 and there was welcome home signs and people were very, very excited about her return, a lot of support but there's still a lot of people raising eyebrows and sayingny things. Does she know all the things that are being said about her. Oh, yes, she knows the things that are being said and there was some behavior people had questioned and we're going to be exploring tonight answers, strange behavior, is that evidence of guilt of a murder? And what about the prosecutors who have been pursuing her so long and the whole time we are talking I just want to say this, we are thinking about meredith kerches family and she is the young woman who died that night in that savage murder but amanda knox will tell you that she could not believe the portrait that was being painted of her and it's a cautionary tale, she says, for everybody about your website, about what you do and what can happen if someone wants to use it to destroy you. I was in the courtroom when they were calling me a devil. I mean, it's one thing to be called certain things in the media, and then it's another thing to be sitting in courtroom fighting for your life while people are calling you a devil. For all intents and purposes i was a murderer whether I was or not. And I had to live with the idea that that would be my life. You know, just weeks ago we said the supreme court -- you alluded to this earlier. She realizes that everything she says to you is going to be scrutinized that's right. As you'll see tonight at times she's guarded. Careful. At times she's open and free and at times she's in tears and we also go back to seattle to see her with her family as they learn that it's not over. It's not over. All right, diane, it is not over because I'm going to stay up past my ime tonight, thanks, diane. You can see -- e-mail me. I will. You can see all of diane's interview tonight on "murder mystery: Amanda knox speaks" airing at 10:00, 9:00 central and amanda knox joins us live tomorrow in times square.
This transcript has been automatically generated and may not be 100% accurate.