The family of the British girl killed in Italy expressed dismay that the original evidence was unreliable and has accepted that Amanda Knox may be innocent after all.

Is this really true? It isn't reflected in the quotes that I've read so far.

I went and did a bit more reading on the Troy Davis case, and I don't think they're that comparable. In the evidentiary hearing, the court found that several of the alleged recantations by witnesses were not recantations at all; most of the witnesses were still claiming Davis's guilt. The murder weapon was never recovered, so they have no prints.

Considering the unreliability of eyewitnesses, especially when the police are encouraging a particular response, it's a lot less confidence than I'd want before applying the death penalty, setting aside the issue of whether it's ever an appropriate punishment, but I don't think it can reasonably be compared to the Knox and Sollecito trial, where the defendants were almost certainly innocent.