- NEW: Knox says the legal proceedings have gotten out of hand, are perverted
- Italian court finds Amanda Knox, ex-boyfriend guilty of murder in retrial
- Knox sentenced to 28 1/2 years in prison
- Both were convicted previously of British student's murder, later acquitted on appeal
Florence, Italy (CNN) -- An Italian appeals court convicted former exchange student Amanda Knox and her ex-boyfriend Raffaele Sollecito on murder charges Thursday night.
Prosecutors said the couple had killed Meredith Kercher in November 2007. They were convicted two years later of murder, but those charges were overturned on appeal in 2011.
A judge said Thursday that Knox, also convicted of slander, was sentenced to 28 1/2 years in prison. Sollecito's sentence was 25 years.
Knox, an American, said her conviction would bring no consolation to the Kercher's family
"I am frightened and saddened by this unjust verdict," she said in written remarks. "Having been found innocent before, I expected better from the Italian justice system. The evidence and accusatory theory do not justify a verdict of guilt beyond a reasonable doubt. ...There has always been a marked lack of evidence."
She called the legal proceedings a travesty.
"This has gotten out of hand. Most troubling is that it was entirely preventable," she said. "I beseech those with the knowledge and authority to address and remediate the problems that worked to pervert the course of justice and waste the valuable resources of the system."
It is unlikely that Knox, who lives in Seattle, Washington, will return to Italy to serve additional prison time because U.S. law dictates that a person cannot be tried twice on the same charge, a legal expert told CNN. He believes that if Italy were to ask for extradition, U.S. officials would deny the request.
Raffaele Sollecito, Amanda Knox's former boyfriend, sits with his lawyer in an Italian court Wednesday, November 6, defending himself at a retrial in the 2007 killing of British exchange student Meredith Kercher. Sollecito and Knox were convicted in 2009 of killing Kercher, 21, who was found stabbed in November 2007 in the villa that she and Knox rented in the central Italian university town of Perugia. 
Patrick Lumumba, the Congolese bartender Knox originally accused of Kercher's murder, talks to the press outside the courthouse during a break form the appeal trial of Knox and Sollecito on September 30. 
Knox appears on NBC's "Today" show. Knox spent four years in jail because of murder charges in the death of her roommate Meredith Kercher while studying abroad in Perugia, Italy. 
Knox and her former boyfriend Sollecito were convicted in 2009 to 25 years in prison (Sollecito got 26 years). The conviction was overturned in 2011 for "lack of evidence." But Italy's Supreme Court decided last year to retry the case, saying the jury that acquitted them didn't consider all the evidence and that discrepancies in testimony needed to be answered. 
Meredith Kercher, a 21-year-old British exchange student, was found dead with her throat slit in an apartment she shared with Knox on November 2, 2007. 
When Knox was detained for questioning in 2007, she implicated Lumumba, the owner of a bar where Knox worked. Lumumba was taken into custody and released after two weeks in prison when his alibi was corroborated. He later won a libel suit against Knox. 
Sollecito, Knox's boyfriend at the time of the murder, was convicted in December 2009 with Knox and released when their cases were overturned. Prosecutors testified that police scientists found Sollecito's genetic material on a bra clasp of Kercher's found in her room, while his defense claimed there wasn't enough DNA for a positive ID. 
Rudy Hermann Guede, an Ivory Coast native raised in Perugia, was convicted separately from Knox and Sollecito and is now serving 16 years. Guede admitted to being with Kercher on the night she died, but said he didn't kill her. Both Knox and Sollecito argued that he was the killer, and Guede suggested the couple took Kercher's life. 
Meredith Kercher's family lawyer Francesco Maresca, left, argued in court in 2011 that the multiple stab wounds implied more than one aggressor killed Kercher. Pictured from left are Maresca, Kercher's father John, sister Stephanie, brother Lyle and brother John at a press conference in 2008. 
Carlo Dalla Vedova, one lawyer on Knox's defense team, argued in court that "the only possible decision to take is that of absolving Amanda Knox" in his closing argument for her appeal hearing. 
Carlo Pacelli represented Patrick Lumumba in his civil suit case. He called Knox two-faced and a "she-devil." 
Giulia Bongiorno, the lead lawyer on Raffaele Sollecito's defense team, compared Knox to Jessica Rabbit on the movie "Who Framed Roger Rabbit?" Knox is not bad, just "drawn that way," Bongiorno said in her closing statements in the 2011 trial. 
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Photos: Amanda Knox and Raffaele Sollecito at trial 
Legal Analyst: She could be reconvicted Legal Analyst: She could be reconvicted 
Amanda Knox's ex takes stand in retrial "She was once put in jeopardy and later acquitted," said Sean Casey, a former prosecutor who is now a partner at Kobre & Kim in New York. "Under the treaty, extradition should not be granted."
Presiding judge Alessandro Nencini has 90 days to write his arguments behind the jury's ruling. Once that is out, lawyers have 90 days to appeal.
Kercher, 21, of Great Britain, was found partially nude in a pool of blood in the house she shared with Knox in the picturesque town of Perugia, where both women were exchange students.
Knox has said she is afraid to return to Italy, where she spent four years behind bars.
"I will become ... a fugitive," she told Italian daily La Repubblica this month, when asked what she would do if she was found guilty in the second trial.
Italy's Supreme Court in March overturned the pair's acquittals, saying that the jury did not consider all the evidence and that discrepancies in testimony needed to be answered.
The case was sent to a retrial in Florence.
Dressed in a purple sweater with sunglasses nestled on his collar, Sollecito made it to the tribunal for the morning session and was expected to return for the verdict, but his attorney, Luca Maori, said that his Italian client would not be coming back to court.
Amanda Knox retrial verdict: Six things to know
Ruling unclear
The retrial began in September, refocusing international attention on the case that grabbed headlines in Italy, Britain and the United States -- but neither Knox nor Sollecito were present in court.
It has renewed questions about the effectiveness of Italy's justice system, given widespread doubts over the handling of the investigation and key pieces of evidence.
Both Knox and Sollecito have maintained their innocence.
'Fugitive'
Knox, 26, and Sollecito, 29, were convicted in 2009 of killing Kercher, who was found with more than 40 stab wounds and a deep gash in her throat.
Prosecutors say she was held down and stabbed after she rejected attempts by Knox, Sollecito and another man, Ivory Coast-born Rudy Guede, to involve her in a sex game. Guede is the only person in jail for the murder, and many aspects of the crime still remain unexplained.
Speaking on Thursday, Knox's defense team asked for an acquittal.
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Dr. Drew weighs in on Amanda Knox Knox has always denied murdering Kercher and has maintained she is not guilty in a written statement to the Florence court.
"I must repeat to you. I'm innocent. I did not rape, I did not steal ... I did not kill Meredith," Knox said in a lengthy e-mail presented by her lawyer to the court in December.
Sollecito was in the Dominican Republic at the start of the retrial but returned to Italy.
In November, he took to the stand to make a spontaneous declaration, saying the charges against him were "absurd."
"For me, it's a nightmare that goes beyond imagination," he said of what he's been through.
'No one remembers Meredith'
The case has dragged on for more than six years, frustrating attempts by Kercher's family to discover the truth about her death. The three trials have done little to clear up mysteries surrounding the details of the murder.
"They are tired of this long trial and they want justice," Francesci Maresca, attorney for the Kercher family, said.
The Kercher family welcomed the retrial ruling, Maresca said in March, adding they believed the ruling that acquitted Knox and Sollecito was "superficial and unbalanced."
They believe more than one person was in the room when Kercher was killed, he said.
"No one remembers Meredith, while the two defendants write books, speak to the media and earn money," Maresca told the court in closing remarks last month.
Ferguson advocates for Knox
One person who has been advocating for Knox is Ryan Ferguson -- the Missouri man who walked free last November after being imprisoned for nearly a decade. He was wrongly convicted of murdering a newspaper editor, and a state appeals court overturned his conviction.
"We kind of had this connection in the sense that we've been through this justice system ... It's relatively the same. We've been through this, and there's not a whole lot of people" who've had the same experience, he told CNN's "New Day."
"So it's cool and we can kind of just talk to each other. She wanted to reach out and say if you need to talk to anybody, if you need any help, I'm here for you. If not, I completely understand. So that's how we began communicating."
Asked about Knox' current state of mind, he said she's staying positive.
"She seems to be doing very well. I'm impressed with her. It's so daunting at this time," he said. "Within 48 hours she should know her fate. You can't start living life until they actually clear you and until you're free essentially. So I'm amazed how she's doing. She's working hard on school and continuing life the best she can. She believes the courts are going to do the right thing based on the facts. I agree."
CNN's Hada Messia reported from Florence, Italy. Steve Almasy reported and wrote from Atlanta. CNN's Livia Borghese. Elwyn Lopez and Alexa Miranda contributed to this report
