Interesting comments from the 3 jurors in the GMA interview! I noticed 2 of the jurors said they went into the deliberation phase ready to vote for death. Only the cowboy said he came to the conclusion death was the appropriate sentence during deliberations. In fact the other 2 jurors mentioned how their opinion on death vs life swung during the penalty phase.
The admonition from the judge is that jurors are not to form any conclusions and are expected to keep an open mind until they've heard all the evidence in the case and only then as they deliberate with their fellow jurors. I'm sure this is a difficult task as people are human and humans do form conclusions in their mind. This admonition is given by the judge at least once every day of trial, and sometimes multiple times.
I wonder if it wasn't only J#17 who went in to the deliberation phase with their mind already made up. The difference is that J#17 was the contrarian holdout who wasn't going in the right direction. Along with that it appears J#17 was inarticulate at a minimum or stubborn and oppositional at the other spectrum, which just made the whole process of deliberations moot. And frankly J#17 sounded dumb, using a made-for-TV movie to create the persona of JA in her mind. Well duh, of course the reality would be different. Sitting in a courtroom, shackled under her clothes, already incarcerated for years, the reality of the killer would be much less visceral than what was portrayed on TV, accompanied by crescendoing dramatic music.