the third suspect patrick lumumba had an airtight alibi. he was in his crowded bar that night.ot have been involved. then the actual forensic tests came back. >> when i looked at it, i was horrified. >> greg hampinkini is a forensic investigator and director of idaho's innocence project. he also was working with the knox defense team. he says italian investors did a good job processing the crime scene, collected excellent evidence, but clung to shakier evidence that proved their theory. a classic error. a prosecutor who trusted his gut feeling instead of the science that at that time was pointing to another suspect. >> they didn't like the way amanda behaved, whatever that means, and so they wanted to investigate her and rafaelle and her boss. when the dna is finally processed, it's not any of their suspects. what do you do? what would you do? you let them go. >> narrator: as patrick lumumba was being released from jail, investigators analyzing the bloody evidence left at the crime scene found an entirely new suspect. his name? rude guede, a known petty criminal from the ivory