Amanda Knox's alibi is looking increasingly dubious. Footage from a surveillance camera allegedly shows that Knox may have been at the home she shared with Meredith Kercher the night Kercher was murdered. 

The surveillance camera clip, which was initially released by the Italian investigative program Quarto Grado, shows a woman resembling Knox walking through Perugia, Italy on Nov. 1, 2007, which is the night Kercher, 21, was murdered in the Perugia home she shared with Knox. 

Italian news station CCTV released the footage of a woman who could be Knox next to a photo of Knox for comparison, The New York Daily News reports.  

However, Knox claims that she spent that night with her then-boyfriend Raffaele Sollecito, who was also charged with the murder. 

The TV program claims that Kercher was also captured on camera as she walked by two minutes earlier. 

During the trial, prosecutors and defense lawyers aware of the footage thought it would not be helpful to either side of the case, and decided against showing it. 

Barbie Latza Nadeau, who wrote a book about the case, told the The Times of London that the woman in the video and Knox share similarities, including the way they walk. 

"If that is Amanda, she proves herself a liar if she is not a murderess," Nadeau told The Times of London.

Both Knox and Sollectio served four years in prison for the murder, but were acquitted by an appeals court and released in 2011. Knox then returned to her hometown of Seattle, Washington.

A new appeals trial began in 2013, and the pair was convicted once again for Kercher's murder in January. Knox did not return to Italy for the re-trial out of fear of being re-convicted. 

Last week, an Italian court released a 337-page report explaining why it re-convicted Knox and Sollecito. 

Knox went on American television last week to defend her innocence. 

"I did not kill my friend," Knox told CNN last week.

"If I were there, I would have traces of Meredith's broken body on me," she said. "And I would have left traces of myself around Meredith's corpse. I am not there. And that proves my innocence."

You can see the surveillance photo here.