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I understand the case is not proven rather than not guilty, the problem for me is if I found someone in my halway I'd challenge him, especially if I'd just found my daughter lying dead in a pool of blood. I would not make an assumption, and I doubt the killer after such an attack could calmly walk away after meeting the family of his victim.
I found it odd (at the time) that there was so little blood on him but I found it stranger that his wife could believe he did it, she's seen something in him, surely?
I doubt we'll ever know conclusively, he is though a very convincing liar (it's been proven) you can trust a thief but you can never trust a liar and that will always count against him.
Why would independent witnesses lie about the event?