She might have done it, and she did lie. But I have not seen any evidence that proves that. The knife had her DNA on the handle, but the DNA on the blade was too small to give reliable results and would not even be admissible in a US court. And to top it off, the blade was a different size than the blood impression on the bed sheets and a different size than the cuts on the victim. Amanda killing someone for sex like the prosecutor suggested is just not believable.