If she had been at the scene of the crime, forensic evidence would prove her guilt, but Amanda Knox says there is nothing - no DNA, no hair, no footprints, no handprints - to show she was there.
Knox spoke in an exclusive interview with CNN on Thursday, two days after an Italian court released an explanation of her conviction.
In a retrial, Knox and Raffaele Sollecito, her then-boyfriend, were found guilty in the 2007 death of Meredith Kercher, Knox's onetime roommate.
"I did not kill my friend. I did not wield a knife. I had no reason to," Knox said.
"In the month that we that we were living together, we were becoming friends. A week before the murder occurred, we went out to a classical music concert together ... We had never fought."
Knox struggled to speak at moments in the interview, seemingly overcome by emotion and thoughts of Kercher. But, for the most part, she was calm, collected and methodical in how she broke down arguments in the case.
In its more than 300-page document, the Florence appeals court said a third person convicted in the murder, Rudy Guede, did not act alone, and cited the nature of the victim's wounds.
Ruling Judge Alessandro Nencini, who presided over the second appeal in the case, said Kercher and Knox disagreed over the payment of the rent in the house they shared in Perugia and that "there was an argument then an elevation and progression of aggression."
Knox dismissed those allegations out of hand.
"If I were there, I would have traces of Meredith"s broken body on me. And I would have left traces of myself around - around Meredith's corpse," she said.
"And I - I am not there. And that proves my innocence."
MORE ON THE SAGA:
Italian court explain Amanda Knox conviction
By Barbie Latza Nadeau, CNN, Wed April 30, 2014
An Italian court says it convicted Amanda Knox and her former boyfriend of murdering her onetime roommate in part because of evidence showing that more than one person killed the British student.
The Florence appeals court released its explanation Tuesday, less than three months after it convicted Knox and Raffaele Sollecito in Meredith Kercher's 2007 death in a retrial.
In the more than 300-page document, the court said that a third person convicted in the murder, Rudy Guede, did not act alone, and cited the nature of the victim's wounds.
ONE YEAR AGO:
Last year, May 2013, Chris Cuomo sat down with Knox and she told him she's scared to return to Italy to face a new trial nearly six years after her study-abroad roommate's slaying. But she's considering it.
"I'm afraid to go back there," she said.
"In Italy," she added, "people think it's arrogant of me to sit here in the United States and have a book come out and defend myself. And first of all, I find that incredibly unfair, because I have the right to defend myself. And no one can ask me to just shut up because it's convenient. But at the same time, I want to prove to them that I care about what's going on."