I've been watching "Innocent Man" on Netflix and at one point it reveals that a case was seriously mishandled and information was concealed because the police were trying to protect someone involved who was actually guilty of the crime. Given how small Huntsville is, even more-so back then, I wonder if maybe it was someone from the prison who did it and they happened to know the policeman/detective and they have been hindering the progress as a means to protect him. I dunno, with the lack of information shared and how some of it is so vague, it makes me wonder.