We're hearing this morning new reaction from Amanda Knox and the family of slain British student Meredith Kercher.

Watch: Guilty Verdict in Amanda Knox Retrial

On Thursday, an Italian appeals court upheld the guilty verdict against Knox and former Italian boyfriend Raffaele Sollecito, sentencing her to 28.5 years in prison.

The two were convicted for Kercher's murder in 2009, but then an appeals court overturned the verdict two years later.

If this latest ruling is upheld by Italy's highest court, officials could seek her extradition from the U.S. That appeals process is expected to take at least another year.

Meantime, Italian authorities visited Sollecito at a hotel near the Italy-Austria border to stamp his passport so he cannot leave the country.

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Knox appeared on ABC's "Good Morning America" this morning (clip above), saying she can only hope that people believe in her innocence.

"I think the answers are out there and I really, really ask that people try to look for those," she told Robin Roberts.

"This really has hit me like a train, I really did not expect this to happen," she said of the new conviction. "You have to stand up for yourself, and you have to believe it's going to be OK."

Kercher's family also spoke out this morning in a press conference, with her brother calling for Knox to return to Italy under the countries' extradition process.

Kercher was found with her throat cut inside the flat she shared with Knox in Perugia in 2007.

Read more about the case and new conviction at FoxNews.com.

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On Fox and Friends this morning, Geraldo Rivera reacted to the latest development in the internationally-watched case. Rivera said that he believed Knox would be found guilty again because of how the case has been presented by the Italian media.

"The media in Italy have made this a cause célèbre. Ya know, this spoiled American rich girl, we gotta bring her back here to face Italian justice. So they've been on a campaign," he said, adding there is no new evidence in the case.

If Knox loses her appeal of the latest conviction, Rivera believes she still will not be extradited even though there is a treaty between the nations.

"Under American law, she could not be retried a second time for the same offense, same evidence, double jeopardy. Amanda Knox doesn't return to Italy," said Rivera.