ROME, Italy (CNN)  -- American college student Amanda Knox told an Italian courtroom Friday that she was at the home of her boyfriend the night her roommate was killed two years ago, her attorney said.





American college student Amanda Knox, 21,  testifies Friday at her murder trial in Perugia, Italy.





When she later was told that her roommate, British student Meredith Kercher, was found dead, Knox said in Italian, "I was like, 'No, no, how can this be?' "





Knox, a 21-year-old from Seattle, Washington, testified that she was at her boyfriend's apartment, smoking marijuana, on the night Kercher was killed. Both Knox and the boyfriend are charged with murder and sexual assault in the case.





She said she later gave a confused and conflicting deposition to police because she was confused by the questioning and felt pressure from the investigators.





She testified that on the night of November 1, 2007, when Kercher was killed, she was at her boyfriend's house all night and not at home, where Kercher's body was found the next day.  Watch Knox take the stand »





Knox is scheduled to resume testifying Saturday, when prosecutors plan to question her. The trial opened January 16.





After her testimony Friday, Knox's father, Kurt Knox, said he thought his daughter did well on the stand and predicted that her innocence would become more apparent as the trial continues.





Kercher family attorney Francesco Maresca, however, said the Knox on the stand Friday was a different person from the Amanda Knox seen at a preliminary hearing. She questioned who the real Amanda Knox is.





On the stand Friday, Knox said she was with her then-boyfriend, Raffaele Sollecito, on the night of November 1. She said she checked her e-mails at his place before the couple had dinner, watched a movie, smoked a marijuana joint, made love and fell asleep.





In the morning, Knox testified, she went home to the villa she shared with Kercher to take a shower. That's when she noticed a series of "strange things," including dried blood in the sink and on the bath mat, unflushed feces in the toilet and a locked door to Kercher's room.





The door to the villa had been left open, too, but Knox said she figured one of her housemates had simply stepped out quickly for an errand or to go for a run. She said she called out but nobody answered.





When Knox got back to Sollecito's house, she told him about the strange things, and he suggested they call the police, Knox testified. Sollecito called his sister, a member of the Carabinieri, the Italian military police, Knox said.





They returned to the girls' villa to check whether anything had been stolen, Knox said. Once there they met Knox's other roommate, Filomena Romanelli, and the Italian Postal Police.  Watch Knox in court »





As Knox stood outside, police went in and began shouting and banging down Kercher's door, Knox said. Between trying to understand what police were saying and having Sollecito translate for her, Knox testified that she got a confused picture of what was going on.





She sat in Romanelli's car to warm up, and that's when she heard Kercher was dead, Knox said.





"I closed in inside myself," Knox testified in Italian. Continuing in Italian, but using English phrasing, she said, "I was like, 'No, no, how can this be?' "





Kercher's body was found half-naked in her bed November 2, 2007. Prosecutors have said Kercher, 21, died in a "drug-fueled sex game" with Knox and Sollecito, now 25. An investigating judge found that Kercher died fighting off a sexual assault.





A third person, Ivory Coast native Rudy Hermann Guede, was convicted of murder in a fast-track trial in October and sentenced to 30 years in prison. He is appealing the verdict.





Defense attorneys are expected to argue
who was found dead who takes stand who faces murder charges Where was the murder trial? Where was Kercher found dead?
Meredith Kercher, Amanda Knox, Amanda Knox, Perugia, Italy. at home,
question: who was found dead, answer: Meredith Kercher, | question: who takes stand, answer: Amanda Knox, | question: who faces murder charges, answer: Amanda Knox, | question: Where was the murder trial?, answer: Perugia, Italy. | question: Where was Kercher found dead?, answer: at home,