Amanda Knox's legal team says it fully expects her to be proved innocent at retrial.
Speaking to NBC's Today show, Theodore Simon says nothing has changed and insisted "there was no evidence before, and there is no evidence now".
Watch the interview in full from NBC News.
Speaking to American breakfast show, Good Morning America, Amanda Knox's lawyer said:
Raffaele Sollecito says he is "disappointed" that his acquittal has been overturned in Italy.
Speaking to the Italian news agency, ANSA, Lawyer, Luca Mauri said: "Today is his birthday, he's 29. He shouldn't be disappointed because he's innocent. He thought the end could be coming to this affair".
Amanda Knox and Raffaele Sollecito have been ordered to face retrial for the murder of British exchange student Meredith Kercher.
Meredith's body was found in her apartment in Perugia on November 2, 2007. Here are the key events in the six year saga:
- November 6, 2007: Amanda Knox is arrested along with Raffaele Sollecito, and Diya "Patrick" Lumumba, the owner of a pub Knox occasionally worked. Lumumba released due to lack of evidence.
- December 6, 2007: Ivory coast national Rudy Guede extradited from Germany and arrested upon arrival in Italy
- October 28, 2008: Judge indicts Knox and Sollecito on murder and sexual assault charges. Guede convicted of murder and sexual assault and sentenced to 30 years
- December 4, 2009: Knox and Sollecito found guilty of murder and sexual assualt, sentenced to 25 years.
- November 24, 2010: Appeal trials for Knox and Sollecito open
- June 29, 2011: Independent forensics report finds much of DNA evidence used in trial by prosecution is unreliable
- October 3, 2011: Knox and Sollecito cleared of the murder of Meredith Kercher.
Speaking to ITV News from the family home in Coulsdon in south London, Meredith Kercher's sister Stephanie said:
- The US and Italy brought an extradition treaty into force in 1984
- It obliges each country to extradite anyone charged with or convicted of an extraditable offence by a jail sentence of more than one year
- In this case, Italy must give the US specific documents to show they have "probable cause to believe" that Meredith Kercher was murdered, and Miss Knox committed the offence
In a statement, Amanda Knox added that the prosecutors' theory of her involvement in the murder is "completely unfounded and unfair".