Mepark saidI don't think he was innocent, but it wouldn't have hurt to give a polygraph test. But it's done and they can get to finding the real killer since according to them he's out there. Otherwise, I'm over it.
Polygraphs are unreliable, which is why they are not admitted as evidence. Pathological liars can fool them. If he passed the polygraph, it would have ignited a firestorm, but it wouldn't have done anything to prove his innocence or guilt.
I haven't kept up with the story myself. I don't have an opinion as to his guilt, but none of the appeals could find anything legitimate to overturn the verdict.