Because the Ramsey's acted suspiciously, and it seems to me that Patsy wrote the ransom note, I have to think that they know who did it. Or maybe they (or just Patsy) had someone help them cover it up?
I wish I could buy that the Ramsey's were inncocent, since I believed that for so long. I just can't believe they don't know what happened. I do feel Patsy was the killer. I don't think she meant to do it, just lost it in a rage. My mom did that with me, once, and I nearly got my skull bashed in...so I can see how easy it could happen.