From the beginning, it was a case of contradictions, and the questions did not end with the verdict that freed Amanda Knox.
The acquittal of the American and her ex-boyfriend in the murder of her British roommate left open the core mystery of whether anyone _ other than the lone man still behind bars _ took part in the brutal killing.
But it also begged questions that stretch back to the early days of the investigation into the 2007 death of Meredith Kercher.
Why did Knox initially tell prosecutors she was in the apartment that night and had to cover her ears to drown out her friend's screams as she was brutally attacked by a man Knox falsely accused?
There was also a purported burglary at the apartment that night _ staged, prosecutors alleged, by the killers to derail the investigation. Who staged it and why?
And then there was the alibi of Knox's ex-boyfriend, Raffaele Sollecito, whose conviction was also overturned Monday. He claimed he was at home working on his computer the night of Nov. 1, 2007, yet police testified there was no sign he had used it that evening.
Monday's verdict, reversing Knox and Sollecito's 2009 murder convictions, didn't answer any of those questions. And it's unlikely the appeals court's written explanation of its decision _ due within 90 days _ will shed much light, likely rendering the sensational case a mystery for years to come.
On the core question of who killed Kercher, there may yet be further legal wrangling.
A third defendant, Rudy Hermann Guede of the Ivory Coast, was convicted in a separate trial of sexually assaulting and stabbing Kercher, and his 16-year prison sentence _ reduced on appeal from an initial 30 years _ was upheld by Italy's highest court in 2010.
Guede, a small-time drug dealer who fled Italy after the killing and was extradited from Germany to face the charges, acknowledged he was in Kercher's room the night she died but said he didn't kill her. Guede said he believed Knox and Sollecito did, but offered no evidence to back up his claim.
The high court ruling upholding his sentence said Guede didn't act alone, though it didn't name Knox or Sollecito as his accomplices.
"The courts agree he wasn't acting alone," the victim's brother, Lyle Kercher, told a news conference Tuesday. "If those two are not the guilty parties, then who are the guilty people?"
Guede's lawyer Valter Biscotti told The Associated Press he would seek to reopen the case for his client in light of the acquittals of Knox and Sollecito. He refused any further comment.
During his appeals trial, Guede claimed he heard Kercher and Knox argue minutes before the Briton was slain in the apartment they shared.
He said he was at the house with Kercher when he fell ill and went to the bathroom with his iPod. He heard Knox and Kercher argue over money, then heard a "very loud scream" coming from Kercher's bedroom, and rushed to it. There, he said, he saw an unidentified man who tried to attack him. Backing into the hallway, Guede said he heard the man say, "Let's go. There's a black man in the house."
Knox initially told prosecutors that she was home the night of the murder and had to cover her ears against Kercher's screams while she was attacked by Diya "Patrick" Lumumba, a Congolese man who owned a bar where Knox often worked.
In the November 2007 ruling ordering Knox and Sollecito jailed, a judge cited that account, but noted that Knox's memories were confused since she had smoked hashish earlier in the day. Knox didn't explain why she didn't try to help Kercher, and subsequently changed her account.
Lumumba was freed after two weeks in prison for lack of evidence, and has sued Knox for defamation. Separately, prosecutors charged Knox with slander for falsely accusing him _ and that was the sole charge on which her conviction was upheld Monday.
"There is a heavy conviction for slander. Why did she accuse him? We don't know," Prosecutor Giuliano Mignini said Tuesday.
In her final appeal to the court on Monday, Knox said she had been "manipulated" during her police interrogation. She previously accused police of beating her _ a claim that landed her another indictment on slander charges, a case that remains open.
The DNA evidence used to place Knox and Sollecito at the scene of the crime during the first trial was determined to be unreliable by a court-ordered independent review during the appeal. But that wasn't the only testimony purportedly placing them at the scene.
In addition to Guede's testimony and Knox's own initial statement, a homeless man testified for the prosecution that he had seen Knox and Sollecito near the apartment the night Kercher was killed.
The defense insisted his testimony was unreliable, and the witness damaged his own credibility by admitting on the stand to being a heroin addict.
Knox changed her account of her whereabouts. She and Sollecito concurred they were at his apartment the night of the murder, though Sollecito said he wasn't sure if she spent the whole night with him. Knox maintained they had smoked hashish, watched the French film "Amelie" and made love.
Prosecutors also claimed the apartment was unnaturally cleaned of any traces of Knox's presence. The only fingerprint belonging to Knox was on glass, while many more traces were left by two other Italian flatmates and visitors, they said.
Mignini theorized that Knox "herself felt the need to eliminate the traces of her presence" at her home, and accused her and Sollecito of going so far as to stage a break-in at the apartment to make the murder look like a burglary gone bad.
The room of another flatmate had been ransacked and a window smashed with a rock on the night of the murder, but Mignini said evidence showed the window was "quite probably broken from the inside."
There remains no motive for the killing and questions even swirl about the murder weapon.
Prosecutors contend a kitchen knife found at Sollecito's house was the weapon because it matched wounds on Kercher's body and carried traces of Kercher's DNA on the blade and Knox's on the handle. However, the court-ordered review discredited the DNA evidence, saying there were glaring errors in evidence-collecting and that below-standard testing and possible contamination raised doubts over the DNA traces on the blade and on Kercher's bra clasp.
In addition, the defense cast doubt on the knife, questioning why Knox and Sollecito would return it to Sollecito's home if it had been used in the murder. They maintain the real weapon has yet to be found.
Knox's behavior in the hours after the killing raised eyebrows and continues to raise questions about why she would display such apparent disregard after her friend had been brutally murdered.
The American turned cartwheels and did splits at the police station as she waited to be questioned by police, according to investigators and Kercher's friends during the first trial. They said Knox sat on Sollecito's lap, making faces at him, crossing her eyes and sticking her tongue out, while giggling and kissing him.
A lingerie shop owner testified that he saw Knox and Sollecito kissing and hugging in his shop the day after Kercher's body was found. He said Knox bought a G-string and talked about having "hot sex" once the couple _ who had been dating just a week _ got home.
Knox explained her actions as the result of being someone who "tends to act a little silly" under stress.
For Knox's supporters, such behavior was evidence of her innocence and naivete: They were the actions of a girl educated in Catholic schools and who never knew real hardship or tragedy.
Prosecutors painted another portrait _ that of a sex-obsessed, heartless murderer whose first testimony concerned a pink rabbit-shaped vibrator found in the home she shared with Kercher. ("It was a joke," Knox told the court.)
Of all the questions the case presented, Knox's true character remained key. On Monday, speaking fluent Italian, she left the jury that would acquit her with her own assessment:
"I did not kill. I did not rape. I did not steal. I wasn't there," she said.
Winfield reported from Rome.
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