. >> it feels as though all of perusia is attacking the street outside of the courthouse -- >> reporter: knox immediately returned to the united states, her arrival playing out on live tv. >> thank you to everyone who's believed in me. who's defended me. who's supported my family. >> reporter: but knox's in january of 2014, her acquittal was reversed, thanks to determined prosecutor giuliano mignini. >> what were your impressions of him? >> i got to see the prosecutor and his biases and prejudices and ideas. and, you know, human qualities, like wanting to bring justice to meredith kercher. he persisted in errors so long that he convinced himself. i don't know. dance in error. >> reporter: even as the italian courts considered forcing her to return to italy, knox was defiant. >> i will never go willingly back to the place where i -- i'm going to fight this until the very end. >> reporter: finally, 7 1/2 years after meredith kercher was killed, the final verdict. a moment captured for the netflix documentary. the highest court in italy blaming investigation. >> the italian supreme court s