WATCH: Amanda Knox Defends Herself to Diane Sawyer

The woman accused of murder while studying abroad in Italy is facing a retrial. She tells her side of the story tonight

Amanda Knox is about to be re-tried for murder -- but this time, she wants her voice to be heard. Knox, 25, will give her first post-jail TV interview to Diane Sawyer on Tuesday night to promote her new memoir, Waiting to Be Heard. Though we've been seeing her picture in the news since 2007, when she was first accused of killing her roommate Meredith Kercher, it's pretty powerful to see Knox talking about the ordeal in her own words. Watch the preview below.

The American college student had just begun a year abroad in Perugia, Italy, when Kercher was found naked and stabbed to death in their apartment. Knox and her Italian boyfriend Raffaele Sollecito were accused of killing Kercher in a sex game gone wrong, and the salacious case became headline news all over the world. The controversial suspect was found guilty in 2009, but successfully appealed the verdict in 2011 and was able to return to the United States. At that point, she'd served more than three years in Italian prison. Now, if the acquittal is overturned, she could be headed back.

"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," Knox tells Sawyer. "And I had another field of barbed wire that I had ahead of me to crawl through."

"I was so convinced that it was finally going to be over," she adds, "but it just means that it's all the more important that I say what happened and keep fighting for what's right."

The Amanda Knox case is complicated, in part because the Italian justice system is so different from the American one. Knox and Sollecito didn't have a solid alibi for the night of Kercher's murder, but the only evidence against them -- a knife and bra allegedly marked with their DNA -- was later shown to be tainted. Knox made some incriminating statements during a police interrogation, but claims she was tortured and coerced into doing so. It was the tabloid press that truly incriminated her, dredging up salacious details (true or not) about "Foxy Knoxy"'s wild life of sex and drugs, painting her as a she-devil who killed a friend in pursuit of her own pleasure.

The American press has largely viewed Knox's trial as a miscarriage of justice: the nightmare of an innocent American convicted of murder abroad. And while there's no hard evidence against her, there are still enough unanswered questions to bring her side of the story into question. Why did she finger an innocent man -- her own boss -- for the murder? (In her memoir, Knox says she was confused and terrified following her interrogation.) Why was she turning cartwheels outside the police station after her arrest? (Knox has denied that this ever happened, though she admits to some other odd behavior, like singing "ta-da" at the crime scene.) And does smoking marijuana, which Knox has confessed to doing, really explain why she can't recall specific details about the night of the murder?

Finally: If Knox and her boyfriend didn't kill Kercher, then who did? Amanda says she wants answers as badly as anyone else.

"If there needs to be a re-evaluation of looking into the facts, that's fine. Because facts are facts and I'm not afraid of them," she tells Sawyer. "It's not fair that there is not a satisfactory answer for what happened to Meredith, and the attention that's been taken away from her and what happened to her is not fair."

Will hearing the story in Amanda's own words change anybody's mind? We'll find out after the interview airs tonight at 10 on ABC.

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