PERUGIA, ITALY (CNN) - American student Amanda Knox and her murdered British roommate Meredith Kercher had conflicts over the men Knox brought to their shared home, a lawyer for a man accused and then cleared of killing Kercher told an Italian court Monday, citing testimony of Kercher's friends.
Carlo Pacelli sought to portray Knox as sexually promiscuous and a difficult roommate as he fights for damages for Patrick Lumumba. Knox accused Lumumba of the murder in 2007. He was arrested and released after his alibi checked out and later sued Knox for libel.
Knox's accusation of Lumumba shows that she committed the crime, Pacelli argued.
"Amanda Knox told lies," he said.
Knox and her then-boyfriend Raffaele Sollecito were convicted of the killing Kercher in 2009 and are now fighting to have the verdicts overturned. Knox was sentenced to 26 years in prison, while Sollecito got 25.
Lawyers are making closing arguments this week, and a verdict could come as soon as Oct. 3.
Knox was in court Monday, wearing an off-white top and black hooded sweater as the months-long process nears its conclusion.
The defense has sought to discredit DNA evidence linking the two of them to the killing, in which Kercher's throat was slashed. Her semi-clothed body was found in the house they shared in Perugia, a picturesque central Italian university town.
An Italian prosecutor put forward a vigorous defense in closing arguments Saturday of the DNA evidence used to find her guilty.
Prosecutor Manuela Comodi rejected testimony from independent forensics experts that cast doubt on the reliability of the evidence, insisting police forensic officers had handled the DNA material improperly.
Comodi's appearance came on the second day of closing arguments for prosecutors in the appeal. Saturday, he told jurors that the original court had concluded "beyond any reasonable doubt" that blood from both Knox and Kercher found in the bathroom sink had been left there when Knox washed herself after the killing.
The prosecutor also pointed to a partial footprint with Kercher's blood found on a bathroom mat, saying analysis had shown it was most likely left by Sollecito.
He and Knox said they were at Sollecito's house on the night Kercher died, not the villa the two girls shared.
Defense attorneys Sollecito are expected to present their final arguments Tuesday, to be followed by Knox's attorneys Thursday.
Knox and Sollecito are appealing their convictions together, having been convicted in a joint trial. A third defendant, Rudy Guede, was convicted in a separate fast-track trial and is serving a 16-year sentence.