I actually believe he is innocent. I think he is a very bizarre man and rather weird, but I do not think he killed his wife.
The owl theory is not implausible and I am not sure how she died. They had both been drinking.
He may be gay or bisexual, but that is not unusual in married men or certain ages, as a number did marry women. There is nothing to say either way whether she knew and she may have accepted it for all we know. Just because he may have flings with men does not make him a murderer.
The death of the girls' mother was determined to be an aneurysm with which he had no involvement. Who honestly kills a friend, stages it as an accident and then adopts the children? That case should never have been brought up in his trial as it tainted the case.
I do think he loved Kathleen and I do not think he deliberately killed her. I think she may not have been found by him for some time and perhaps if he found her earlier she may still be alive.
If you watch the last episode (I think) where they pay the 911 tape in Court and look at his face and hear him on that tape, either he is a fantastic actor or he is that distraught.
I do think often there is too much desire in America to punish someone for a crime, even if they have the wrong person - Exhibit A on Netflix is another example of that.