Amanda Knox’s retrial took a bizarre turn Friday as an ex-gangster testified that a séance told her the murder weapon used to kill British exchange student Meredith Kercher in 2007 is still buried in a garden in Perugia, Italy, near the scene of the alleged slaying.
Convicted gangster Lucia (formerly Luciana) Aviello, who is undergoing gender reassignment therapy, testified Friday that her brother, Antonio Aviello, killed Kercher.
"On the accusation of my brother, I have not changed my testimony. My brother is guilty. It was not Amanda nor Sollecito," said Aviello.
Aviello first testified about her brother being the real murderer during Knox’s first appeal in June 2011. She also claims her brother, who was a fugitive from the law, is now dead.
Francesco Maresca, the Kercher family attorney, told CNN Aviello's testimony has no credibility. "But the court needs to hear from these witnesses so they can reach a fair and balanced decision in this new appeal."
Judge Alessandro Nencini said Friday Aviello's testimony is one of many "mysteries" in the case.
During Knox’s retrial in 2011, a former cellmate of Aviello testified that Sollecito’s attorney paid Aviello €158,000 for his testimony, which he used for gender reassignment surgery. Aviello denied the accusations that he was paid to testify.
Earlier this week, the judges hearing Knox’s retrial ordered a new DNA test of a key piece of evidence in their former trials.
A knife investigators found in Sollecito's kitchen allegedly containing DNA from the woman they are accused of killing will be retested.
Read more: New DNA test order in Knox retrial
Knox and Sollecito were convicted in 2009, but the pair was released on appeal two years later. The Supreme Court of Italy ruled in March to retry Knox’s case because the jury that acquitted Knox didn’t consider evidence that could support the prosecutor’s accusation that Kercher was killed as the result of a deviant sexual escapade.
Knox finally returned home to Seattle in October 2011, and she has led a relatively low-profile life. However, she has granted a few media interviews and released a book, “Waiting to be Heard: A Memoir.”
A representative for Knox’s family told CNN in August that Knox does not plan to return to Italy for her new trial.
The next court date for Knox’s latest retrial will be held November 6.
-CNN's Barbie Latza Nadeau contributed to this report.