On Saturday, a convicted murderer provided the new information which could clear Amanda Knox, an American girl who was convicted to 26 years in prison for killing her British roommate in Perugia, Italy.

Amanda Knox, a 23-year-old American girl studied in Perugia, rented a house with three other girls. Two are Italian, the other one is Meredith Kercher from Britain. Kercher was sexually assaulted and stabbed to death in her locked room, and her belongings were stolen on 1 November 2007.

In December 2010, Knox was convicted of the killing and sentenced 26 years in prison, whereas her ex-boyfriend Raffaele Sollecito was sentenced 25 years. Both of them denied having committed the crime and appealed.

Rudy Hermann Guede, an immigrant from the Ivory Coast was also involved in the case and sentenced 30 years. But after his appeal, his sentence was reduced to 16 year.

Mario Alessi, a convicted child murderer serving 30 years, testified on Saturday that Guede told him Knox and Sollecito weren't involved in the murder of Kercher.

Alessi said Guede told him that he met Meredith in a bar with some friends of his. And then he followed her and found out the address of her house. A few days later Guede went back to Meredith's house with a drunk friend of his. There they sexually attacked and killed her.

Rudy then told me that he had put a small ivory handled knife to her throat and that it had cut her and his hands were full of blood. He said that his friend had said: 'We need to finish her off or we will rot in jail,' Alessi said.

According to Alessi, Guede's friend fled to the house, whereas he had tried to stem the blood from Miss Kercher's wound before fleeing himself from the scene. Later when they met in a nightclub, Guede gave his friend some cash and told him to run away.

But Guede has denied these allegations.

Five witnesses give testimony in favor of Knox but their reliability is in question. According to the media, Knox is so sneaky that she earned her nickname Foxy Knoxy. Just before she left to study in Italy, Knox was convicted of a misdemeanor and fined $269 because she hosted a student party related with violence, sex, drinking and drug.

Knox's mother told the media Knox is doing everything she can to survive. We tell her to stay strong, she said. She gets huge messages of support from all over the world and she's really grateful for all of those, as are we, and we believe the truth will come out and that she'll be freed.