I followed this case long before it was a documentary so it's interesting to see it become so popular now. After watching the series, reading this entire thread and relying on what I could remember, I think Brendan at worst help after the fact and at worst had absolutely not to do with any of it. Regardless, he did not receive competent representation or a fair trial. He should walk free as far as I'm concerned. As far as Steven Avery is concerned, he creeps me out and always has. He's not a likable person and he's proven himself to be dangerous as well. I think it's very possible he did commit this crime, but I don't think that matters because the investigation was so corrupt, so mishandled it would be nearly impossible to every know he was guilty beyond a reasonable doubt. In fact, all of the evidence was so tampered with or, as in the case of allowing the vehicle to be rained, so improperly handled that no one could ever be found guilty beyond a reasonable doubt. Steven Avery should get a new trial and the investigators should be investigated. I understand Steven Avery and many of his family members were despicable and the proverbial thorn in the side of law enforcement. I understand why they wanted to see him in prison the first time and even more so the second time, but they do not have the right to plant evidence and railroad someone. No matter how despicable a person may be or future crimes you think they might commit, this isn't Minority Report, every single person deserves a fair investigation and trial. Neither of the men convicted in the death of this beautiful, vibrant young lady got that. Like I said, I don't think it would even be possible at this point. It will be very ironic if Steven Avery is freed again, once based on false conviction for a crime he didn't commit and freed again after a conviction for a crime he did commit, but both times because of the arrogance, ignorance and incompetence of the police and prosecutors involved. Emotionally, I have to admit I don't mind the idea of Avery staying prison because I don't like him. On an intellectual level, I know he deserves another trial. Emotionally and intellectual I want Brendon freed!
As far as theories go, if Steven didn't do it, then Chuck did. Chuck is an obvious sexual predator and had the opportunity. I do not believe LE had anything to do with it and were only opportunist who zealously went after some they hated when the chance arose. I think Steven did it or someone else on the property did. I hope we have all the answers someday, but as said already, the case was so botched I have no idea how it could ever happen.