TODAY | September 20, 2013
>>> amanda knox is getting read do relive a nightmare she thought was over. this all surrounds the death of her roommate in 2007 . amanda is here this morning to share her story. but first, a look at why she finds herself back at the mercy of the italian justice system .
>> they acquitted.
>> reporter: it was the decision heard around the world. after four years in jail, amanda knox cleared of the 2007 murder of her roommate inside this apartment in italy. back on american soil, a free woman.
>> thank you so everyone who has believed in me.
>> reporter: in her hometown of seattle, she goes back to college and writes a memoir trying to put the past behind her until it rocks her world again.
>> the acquittal overturned this morning.
>> reporter: they order a new trial forcing knox to face the same murder charges all over again. an investigative journalist who spent a year covering the trial says the new hearing maybe an attempt to resolve any doubts left in the court of the public opinion.
>> the majority of italians believe she is guilty. the supreme court can't be oblivious to that fact.
>> reporter: her family and attorneys are hopeful her acquittal will stand.
>> amanda knox was not involved in this horrific murder and she is absolutely unequivocally not guilty.
>> reporter: knox will be watching from home, a half a world away from the courtroom.