Image: Amanda Knox
Stefano Medici  /  AP
Amanda Knox attends a hearing of her appeals trial at the Perugia court Saturday.
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updated 9/24/2011 7:59:32 PM ET 2011-09-24T23:59:32

Italian prosecutors asked an appeals court on Saturday to uphold the conviction of Amanda Knox for the murder of her British roommate and increase her sentence to life in prison.

The 24-year-old American sat motionless as Prosecutor Giancarlo Costagliola made his request. The prosecutor sought the same sentence for Knox's co-defendant, former boyfriend Raffaele Sollecito, capping two days of closing arguments by the prosecutors.

Costagliola also requested six months of daytime solitary confinement for Knox and two months for Sollecito.

A verdict is expected in early October. Next week a lawyer for the victim's family and the defense teams will deliver their closing arguments.

Knox, of Seattle, and Sollecito were convicted by a lower court of sexually assaulting and murdering Meredith Kercher while they were all studying in Perugia in 2007. Knox was sentenced to 26 years, her co-defendant Raffaele Sollecito to 25 years.

They both deny wrongdoing and have appealed the 2009 verdict.

Video: Knox’s best friend at her side (on this page)

But in Italy prosecutors also can appeal, and they did so in this case, using the appeals court to try for the harsher penalty.

The prosecutors had sought life imprisonment, Italy's harshest punishment, in the original trial, too.

For two days, prosecutors sought to persuade the appeals court that there is sound evidence incriminating the defendants: witness testimony, genetic material, cell phone activity.

Manuela Comodi, summing up the case Saturday, said there is "gigantic, rock-solid circumstantial evidence." The prosecutors believe the defendants deserve the harshest possible punishment because of the brutal nature of the murder, the sexual assault, and the lack of a motive.

"They have killed for nothing," she said.

Kercher was stabbed to death in the apartment she shared with Knox, in what prosecutor said was a drug-fueled sexual aggression.

Curt Knox, the defendant's father, said her daughter had reacted well to the prosecutors' request, which had been expected.

"She was actually fine. She said today was easier than yesterday, mainly because today was technical," he said. "Yesterday it was kind of character assassination that they tried."

Earlier Saturday, Comodi defended the forensic evidence that had been used to convict Knox, firing back at an independent review that criticized the investigation and the work of police in the case.

The DNA is crucial in the case, where no clear motive for the brutal killing has emerged.

Prosecutors maintain that Knox's DNA was found on the handle of a kitchen knife believed to be the murder weapon, and that Kercher's DNA was found on the blade. They said Sollecito's DNA was on the clasp of Kercher's bra as part of a mix of evidence that also included the victim's genetic profile.

But those findings were always disputed by the defense, and the appeals court decided to appoint two independent experts to review the evidence.

The independent experts challenged both findings. They said police had made glaring errors in evidence-collecting and that below-standard testing and possible contamination raised doubts over the attribution of DNA traces, both on the blade and on the bra clasp, which was collected from the crime scene several weeks after the murder.

The review significantly weakened the prosecution case, giving Knox and her supporters hope that she might be freed after four years behind bars.

Sensing dangers, prosecutors have fought hard to try to undermine the review's results. They described it as superficial and sketchy. In several hearings in past weeks, and then again during summations Friday and Saturday, the prosecutors challenged the review point by point.

Francesco Maresca, a lawyer for the Kercher family, supported the prosecution's stance on the review. Speaking after the court proceedings, he said: "They deserve the just penalty. Killing a girl — or anybody else — is punished by Italian law with life in prison, so they deserve life in prison, if they are found guilty."

Knox herself is expected to address the court before deliberations.

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Video: Prosecutors want to increase Knox’s sentence

  1. Transcript of: Prosecutors want to increase Knox’s sentence

    LESTER HOLT, anchor: Overseas now to Italy and yet another twist in the appeals trial of American Amanda Knox . In their closing arguments, prosecutors today sought not only to uphold her conviction, but asked the court to increase Knox 's sentence for the murder of her roommate. NBC 's Keith Miller has our report tonight from Perugia .

    KEITH MILLER reporting: It was the prosecution's last chance to make the conviction stick. Calling the circumstantial evidence against Amanda Knox and her former boyfriend rock solid, the prosecution team spent two days attacking independent forensic scientists, the defendants, and the media. Prosecutor Giuliano Mignini warned the judge and jury not to be deceived by the defendant's clean-cut appearance, declaring, 'There is a dark side in all of us.' Knox 's lawyers insist their client is innocent.

    Mr. CARLO DELLA VEDOVA (Amanda's Attorney): They have not brought anything new. Their appeal, instead, has confirmed that there's a lack of evidence. So it's going well.

    MILLER: Today the prosecution attempted to persuade the judge and jury that the case is sound, even though DNA evidence was declared unreliable by court-appointed forensic scientists. Specifically, the alleged murder weapon was found not to contain the victim's DNA on the blade, as asserted by the prosecution. And a bloody bra clasp, allegedly containing the DNA of Knox 's former boyfriend, was considered too contaminated to test. The prosecution is so convinced its case will hold up, it asked the court to increase the sentence on Knox and her former boyfriend to life in prison . That's 30 years behind bars here in Italy . Knox 's father was not surprised by the prosecution's request for the maximum penalty, but still shocked.

    Mr. CURT KNOX (Amanda's Father): You know, it's always a tough reaction when you have somebody ask for 30 years or life in prison for your daughter.

    MILLER: The case continues next week, with a verdict due by the beginning of next month. Keith Miller , NBC News, Perugia.

Photos: Amanda Knox: Her long legal saga

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  1. Amanda Knox: Her long legal saga

    The long legal saga of Amanda Knox, an American student accused of the violent death of her roommate, British student Meredith Kercher, has made headlines around the world since it began in Perugia, Italy, in late 2007.

    Reversal of fortune
    From left, Pierluigi Puglia, member of the British consulate in Italy; Stephanie Kercher, sister of the late Meredith Kercher; her brother, Lyle Kercher, and lawyer Francesco Maresca speak to the press in Florence on Jan. 31, 2014, the day after the guilty verdicts against Amanda Knox and Raffaele Sollecito for the murder of UK student Meredith Kercher in 2007 were reinstated in Italy. The verdict overturned Knox and Sollecito's successful appeal in 2011, which released them after four years in jail. (Franco Origlia / Getty Images) Back to slideshow navigation
  2. Reconvicted

    Amanda Knox is shown here in Seattle after serving four years in prison after being convicted in a case involving the murder of her British roommate, Meredith Kercher. Her former boyfriend Raffaele Sollecito is shown here in Florence, Italy, on Jan. 20, 2014. Though both were acquitted on appeal and released in 2011, they were re-convicted of the murder on Jan. 30, 2014. (Splash News, AP file) Back to slideshow navigation
  3. Awaiting another verdict

    Raffaele Sollecito leaves court in Florence, Italy, on Jan. 30, 2014. The Italian ex-boyfriend of Amanda Knox awaited the court's verdict in the retrial of both Knox and himself for the murder of Meredith Kercher more than two years after they were acquitted. (Maurizio Degl' Innocenti / EPA) Back to slideshow navigation
  4. A new trial

    Francesco Maresca, lawyer for the family of Meredith Kercher, talks to reporters as he arrives for the start of Amanda Knox's second appeals trial in Florence, Italy, Monday, Sept. 30, 2013. Italy's highest court ordered a new trial for Knox and her former Italian boyfriend, overturning their acquittals in the 2007 slaying of Kercher. (Francesco Bellini / AP) Back to slideshow navigation
  5. Not going back

    Amanda Knox appeared on TODAY on Sept. 20, 2013, to discuss her upcoming retrial in Florence for the murder of her British roommate Meredith Kercher. Knox maintained that she would not go back to Italy to face trial again: "It's not a possibility, as I was imprisoned as an innocent person and I just can't relive that," she told Matt Lauer. (Peter Kramer / NBC) Back to slideshow navigation
  6. A memoir

    Filled with details first recorded in the journals Amanda Knox kept while in Italy, "Waiting to be Heard," Knox's memoir, is set to be released on April 30, 2013. (HarperCollins via AP) Back to slideshow navigation
  7. Acquittal overturned

    Luciano Ghirga, lawyer of Amanda Knox, center, talks to journalists as he leaves Italy's Court of Cassation in Rome on March 26, 2013. Italy's highest criminal court overturned the acquittal of Amanda Knox in the slaying of her British roommate and ordered a new trial. The court ruled that an appeals court in Florence would have to re-hear the case against the American and her Italian-ex-boyfriend for the murder of 21-year-old Meredith Kercher. (Gregorio Borgia / AP) Back to slideshow navigation
  8. Home at last

    Amanda Knox makes remarks after arriving in Seattle a day after her release from prison in Italy on Oct. 4, 2011. She was acquitted of murder and sexual assault by an Italian appeals court after spending four years in custody over the killing of her British housemate, Meredith Kercher. At left is her father, Kurt Knox. (Dan Levine / EPA) Back to slideshow navigation
  9. Welcome home

    Well-wishers greet Amanda Knox upon her arrival at Sea-Tac Airport in Seattle a day after her release from prison in Italy on Oct. 4, 2011. (Dan Levine / EPA) Back to slideshow navigation
  10. Tears of relief

    Amanda Knox cries after hearing the verdict that overturned her conviction and acquits her of murdering her British roommate Meredith Kercher, at the Perugia court on Monday, Oct. 3. The Italian appeals court threw out Amanda Knox's murder conviction and ordered the young American freed after nearly four years in prison. (Pier Paolo Cito / AP) Back to slideshow navigation
  11. Home front

    Supporters of Amanda Knox react as they watch a news broadcast about her appeal verdict from a hotel suite in downtown Seattle on Oct. 3. (Elaine Thompson / AP) Back to slideshow navigation
  12. Sisterly support

    Amanda Knox's sister Deanna Knox, center, cries tears of joy in Perugia's Court of Appeal after hearing that Amanda won her appeal against her murder conviction on Monday in Perugia, Italy. (Oli Scarff / Getty Images) Back to slideshow navigation
  13. Closing arguments

    Amanda Knox, accused of the 2007 murder of her housemate Meredith Kercher, arrives in court as her appeal trial resumes in Perugia, on Sept. 30, 2011. Wrapping up the defense case, Knox's lawyer, Carlo Dalla Vedova, points to alleged errors by police and urges a panel of lay and professional judges to look beyond how Knox has been portrayed by the media and the prosecution. (Tiziana Fabi / AFP - Getty Images) Back to slideshow navigation
  14. Hoping for her release

    Amanda Knox's lawyer, Luciano Ghirga (left), and her father, Curt Knox (right), use their mobile phones at the court during her Sept. 30, 2011, appeal trial session in Perugia. (Alessandro Bianchi / Reuters) Back to slideshow navigation
  15. Her fate in the balance

    Amanda Knox arrives at the court during her appeal trial session in Perugia, Italy, on Sept. 30, 2011. (Alessandro Bianchi / Reuters) Back to slideshow navigation
  16. Her ex-boyfriend

    Raffaele Sollecito attends his appeal hearing at Perugia's Court of Appeal on Sept. 29, 2011 in Perugia, Italy. Amanda Knox and Raffaele Sollecito are awaiting the verdict of their appeal that could see their conviction for the murder of Meredith Kercher overturned. (Oli Scarff / Getty Images) Back to slideshow navigation
  17. He calls her 'she-devil'

    Carlo Pacelli (center), lawyer for Patrick Lumumba, (left) -- a barman who is seeking damages from Amanda Knox as part of a civil case running alongside her murder appeal -- speaks outside the Perugia courthouse on Sept. 26, 2011. Pacelli called Knox a "she-devil" and told the appeals court she destroyed Lumumba's image by falsely accusing him of the murder, testimony that helps prosecutors attack her credibility. Knox has said she wrongly implicated Lumumba under pressure from police. . (Mario Laporta / AFP - Getty Images) Back to slideshow navigation
  18. Legal battleground

    Through the bars of holding cells, a view of the courtroom in Perugia on Sept. 6, 2011, before the resumption of the appeal trial of Amanda Knox and her Italian ex-boyfriend, Raffaele Sollecito. (Fabio Muzzi / AFP - Getty Images) Back to slideshow navigation
  19. New 'do

    Sporting a new, short haircut, jailed Amanda Knox attends a preliminary hearing in Perugia, Italy, on June 1, 2010. (Fabrizio Troccoli / AP) Back to slideshow navigation
  20. Awaiting sentence

    Amanda Knox is driven into court at midnight to hear the sentence in her murder trial on Dec. 5, 2009, in Perugia, Italy. Knox was convicted of the murder of British student Meredith Kercher was sentenced to 26 years in prison. Her former Italian boyfriend, Raffaele Sollecito, was also convicted of the murder charges. He was sentenced to 25 years. (Franco Origlia / Getty Images) Back to slideshow navigation
  21. Pleading her case

    Amanda Knox looks on during a break in the closing arguments of the murder trial in Perugia, Italy on Dec. 3, 2009. She read a statement during her murder trial on Dec. 3, in Italiian saying, "I am afraid of having the mask of a murderer forced onto my skin." (Max Rossi / Reuters) Back to slideshow navigation
  22. Police escort

    Murder suspect Amanda Knox, right, is escorted by a police officer as she arrives at Perugia's court, Italy, Friday, Nov. 20, 2009. Italian prosecutors have begun their closing arguments in her trial. (Alessandra Tarantino / AP) Back to slideshow navigation
  23. The murder weapon?

    Prosecutor Manuela Comodi shows a knife during a hearing in the murder trial for Meredith Kercher in Perugia, Italy, on Sept. 19, 2009. The knife, wrapped in plastic and kept in a white box, was shown to the eight-member jury during the trial of Amanda Knox and her former boyfriend, Raffaele Sollecito. (Stefano Medici / AP) Back to slideshow navigation
  24. Victim in video

    At the trial of Amanda Knox, a music video that included an appearance by slain student Meredith Kercher was shown June 8, 2009. Kercher played the love interest in the video for the song "Some Say" by London musician Kristian Leontiou. The 2007 video was shot only weeks before Kercher died in Perugia, Italy, at age 21. (TODAY) Back to slideshow navigation
  25. Boning up?

    Amanda Knox holds the Italian penal code book at the trial of slain British student Meredith Kercher in Perugia, Italy, on Jan. 16, 2009. (Daniele La Monaca / Reuters) Back to slideshow navigation
  26. Back in court

    Amanda Knox, one of three suspects in the murder of Meredith Kercher, arrives at a Sept. 27, 2008 court hearing in Perugia, Italy. Kercher, a British student, was found dead in her Perugia flat on Nov. 1, 2007 with her throat cut. (Tiziana Fabi / AFP - Getty Images) Back to slideshow navigation
  27. Sister speaks out

    Stephanie Kercher reads a statement during a Sept. 15, 2008 press conference in Perugia, Italy as legal proceedings connected to the death of her sister, Meredith Kercher, approach a critical phase. (Antonio Calanni / AP) Back to slideshow navigation
  28. The victim's family

    Arline, mother of Meredith Kercher, answers newsmen questions flanked by Meredith's sister Stephanie, left, and brother Lyle, during a press conference in Perugia, Italy on April 18, 2008. (Leonetto Medici / AP) Back to slideshow navigation
  29. Headed to a hearing

    Amanda Knox's ex-boyfriend Raffaele Sollecito, who along with Knox and Rudy Hermann Guede was held on suspicion in the murder of Knox’s housemate Meredith Kercher, is escorted by Italian police to a January 2008 hearing with magistrates. (Paolo Tosti / AFP - Getty Images) Back to slideshow navigation
  30. Remembering Meredith

    A floral tribute with photographs of Meredith Kercher is shown at her funeral at Croydon Parish Church, South London on December 14, 2007. (Peter MacDiarmid / Getty Images) Back to slideshow navigation
  31. Another suspect

    In December 2007, police in Germany arrested Rudy Hermann Guede, a native of the Ivory Coast, in connection with Meredith Kercher's murder. Here Guede is shown being led away by Italian police after arriving in Rome from prison in Germany. (Riccardo De Luca / AP) Back to slideshow navigation
  32. Arrested, then released

    Patrick Lumumba Diya, a Congolese man who owned a small bar in Perugia where Amanda Knox sometimes worked as a barmaid, was arrested after being implicated in the Meredith Kercher murder by Knox. However, he was released after another suspect, Rudy Hermann Guede, was arrested in the case. He is shown here leaving police headquarters with his lawyer on Nov. 20, 2007. (AFP - Getty Images) Back to slideshow navigation
  33. Under arrest

    Her cap pulled low, American student Amanda Knox was arrested on Nov. 6, 2007, for her alleged involvement in the brutal murder of her housemate, Meredith Kercher. (Pietro Crocchioni / EPA) Back to slideshow navigation
  34. Searching for clues

    Police forensics investigators examined Meredith Kercher's Italian house while a coroner conducted a post-mortem investigation on the slain student's body. (Chris Radburn / AP) Back to slideshow navigation
  35. The murder scene

    On Nov. 5, 2007, the rented hillside home that murder victim Meredith Kercher had shared with fellow student Amanda Knox in Perugia, Italy was a crime scene. (AFP - Getty Images) Back to slideshow navigation
  36. Front-page news

    By Saturday, Nov. 3, 2007 Meredith Kercher's gruesome murder was front-page news in the central Italian city of Perugia. (Chris Radburn / AP) Back to slideshow navigation
  37. The day after

    Amanda Knox, a student from Seattle who had been living with Meredith Kercher in Perugia, was arrested Nov. 6, 2007 for her alleged involvement in Kercher’s murder. Also held by police was Knox’s Italian boyfriend, Raffaele Sollecito. Taken Nov. 2, the day Kercher was found dead, this picture shows the pair outside the rented house Knox shared with Kercher. (Stefano Medici / AP) Back to slideshow navigation
  38. The murder victim

    Meredith Kercher, a 21-year-old British exchange student, was found dead with her throat slit on Nov. 2, 2007 in her room in an apartment she shared with other exchange students in the Italian town of Perugia. (AFP - Getty Images) Back to slideshow navigation
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