Meredith Kercher's sister has welcomed the retrial of Amanda Knox and her Italian ex-boyfriend Raffaele Sollecito saying there were "still questions that are unanswered" for her and her family.

Stephanie Kercher, speaking at her Surrey home, told the Press Association: "Whilst we are not happy about going back to court, and it will not bring her back, we have to make sure we have done all we can for her.

"We still have a long journey ahead and we are very grateful for the support of the public and in Italy - we just want justice for Mez."

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Stephanie Kercher says Meredith's family welcomes the court ruling

"We are very hopeful that it going back to court will help find those answers and find out the truth of what happened that night."

The body of Leeds University student Miss Kercher, 21, was found in November 2007 in her bedroom at the house she shared with Miss Knox in the Italian university town of Perugia.

Her throat had been slashed.

Prosecutors claimed Miss Kercher, from Coulsdon, Surrey, was the victim of a drug-fuelled sex game gone awry.

Miss Knox, now 25, and her Italian ex-boyfriend Raffaele Sollecito, 29 , denied wrongdoing.

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Stephanie Kercher with her brother Lyle Kercher

They were convicted following a high-profile trial but were released on appeal and Miss Knox was immediately flown back to America.

Ivory Coast-born drifter Rudy Guede was convicted in a separate trial of sexually assaulting and stabbing Miss Kercher. His 16-year sentence, reduced on appeal from an initial 30 years, was upheld by Italy's highest court in 2010.

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Raffaele Sollecito (left) and Amanda Knox (right) will face a retrial for the murder of Meredith Kercher (centre)

Italian law cannot compel Knox to return to the country for a fresh trial. She could be found in contempt of court but that carries no additional penalties.

But the latest developments mean Miss Knox could face the threat of an extradition request from the Italian government.

The US and Italy brought an extradition treaty into force in 1984, when Ronald Reagan was president.

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The family light candles in Perugia

The treaty obligates each country to extradite anyone charged with or convicted of an extraditable offence - or any offences punishable under the laws of both countries by a jail sentence of more than one year.

Italy must provide the US with specific documents to demonstrate they have "probable cause to believe" that Miss Kercher was murdered and Miss Knox committed the offence.

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  • Nov. 2, 2007

    British student Meredith Kercher, 21, is found murdered in the Perugia, Italy apartment she shares with 20-year-old Amanda Knox, an American student. Post-mortem examination reveals evidence of sexual activity before death.

  • Nov 6, 2007

    Knox and 23-year-old boyfriend Raffaele Sollecito (right) are arrested. Knox's boss, 38-year-old bar owner Patrick Lumumba, is also arrested after revealing he'd canceled Knox's shift the night Kercher is murdered. He is released Nov. 19.

  • Oct. 28, 2008

    A third suspect, 20-year-old drug dealer Rudy Hermann Guede, is sentenced to 30 years in jail after confessing to being in the house on the night of the murder. He maintains his innocence, instead blaming an Italian stranger for the crime.

  • Sept. 26, 2008

    Knox and Sollecito meet in court for the first time since their arrests.

  • Jan. 16, 2009

    Knox and Sollecito's trial begins.

  • March 6, 2009

    After claiming she was pressured to name a suspect, Knox tells the court she was at Sollecito's house when Kercher's murder took place.

  • Nov. 21, 2009

    Italian prosecutors request life sentences for both Knox and Sollecito.

  • Dec. 4, 2009

    Jury retires to consider verdicts. Both defendants are found guilty. Knox was sentenced to 26 years in prison, while Sollecito received 25 years. On Dec. 19, Guede's sentence is decreased to 16 years.

  • June 17, 2010

    Knox appears at a preliminary hearing in view of her upcoming appeal trial.

  • Oct. 1, 2010

    Knox briefly reappears in an Italian court for a hearing on possible police slander charges.

  • Nov. 24, 2010

    Knox was escorted by a policewoman into the same Perugia courtroom where the first trial was held.

  • Nov. 8, 2010

    Knox is indicted on slander charges for claiming she was beaten by police when questioned in 2007 about her roommate's slaying.

  • Nov. 24, 2010

    Knox returns to court for the start of her appeals trial, about a year after the American student was convicted of killing her British roommate in a case that drew global attention.

  • Nov. 24, 2010

    The appeal trial for both Knox and Sollecito is scheduled to open in Perugia.

  • Nov. 24, 2010

    The 23-year-old was convicted in December 2010 of sexually assaulting and murdering Meredith Kercher, and sentenced to 26 years in prison.

  • Nov. 24, 2010

    Knox chats with her lawyer Carlo Della Vedova.

  • Nov. 24, 2010

    Sollecito, right, is escorted by a penitentiary police guard as he arrives for a hearing in the appeals trial.

  • Nov. 24, 2010

    Knox is escorted by a penitentiary guard.