If the murder had anything to do with the lawsuit, then it had to be the police that killed her.
Or, it was coincidence that another murderer gave them the chance to frame him.
Whatever investigation they did, at some point, they would have had internally some other suspect in mind. Are they corrupt enough to let a murderer go free?
These are the leaps you will have take if you think Avery wasn't the killer, who we have evidence that points that he did it. Are you willing to let him go free because you believe the police could be so corrupt, and only because they hate him personally?
Think about that, while you deliberate a verdict.