There is very little evidence that supports Avery killed her in the trailer, garage or anywhere near the house. Hell, they jackhammered the concrete garage floor and did not find one shred of DNA evidence from anyone not named Avery. The guy was a hoarder, it's literally impossible for anyone, let alone a semi retarded guy (and even dumber nephew) to clean the garage and trailer to the degree that no blood was found. That place looked like Winston Wolfe was there directly after the murder.
But let's just say for sake of conversation he did kill her somewhere close to the home like the state suggests. Why would he put her in the trunk bed to move her less than 20 feet? Why wouldn't he just drag her out to the burn pile and why is there three different burn sites anyway?
Why are Lt. James Lenk and Sgt. Andrew Colburn literally on site every time a piece of key physical evidence is found when they're not supposed to be helping with the investigation? That's down right suspicious outside of the fact that Avery's blood sample was tampered with or the fact that both have something to gain from an Avery conviction.
And how in the hell is the Rav4 found within 20 minutes of walking into the salvage yard? And why, for the first time in the search, did they decide to give one of the searchers a camera "just in case". It should of taken weeks, if not months to search that yard. But nope, these chicks had divine intervention that pointed them in the exact location within minutes. And the guy is a professional salvager. Why doesn't he take the car apart and spread it over the yard?
What about motive? Chad must have seen leaked pics of the rape before Dumb and Dumber cleaned the scene because there is no physical evidence to suggest a rape took place anywhere on the property associated with the evidence. So if she wasn't raped, what was the motive? A guy who had served 18 years for a crime he didn't commit, was starting his life over, ready to get married; just decides to off a girl that he's had a working relationship with?
The case goes cold several times. They coerce the nephew into a false confession without the presence of his lawyer. When that gets thrown out, they then go after the girlfriend, she doesn't cooperate either. Finally, after months of finding nothing, they return to the garage with Lenk present (again) and find more physical evidence. Pretty damn convenient.
If Avery did kill her, which is a possibility, then the state at least knew they didn't have enough to convict. So they made sure they did. The case is circumstantial at best and if I was on that jury I would have said that there is reasonable doubt that Avery didn't do it.
Of course Avery is the only suspect. He was the only one investigated. The victim's roommate did not report her missing until her family called to see if he had seen her. He's never investigated nor is her ex boyfriend. No one, other than their "man" Avery, was ever investigated. Not the other nephew or his Step Father who are both on the grounds at the time. No one. . .not one person.
So with no left to blame and with key evidence likely planted, the state pitches their case to a tainted jury and they convict.