It appears they withheld his identity from the defense .
As I understand it, the prosecution is required to disclose to the defense any and every thing they plan to introduce in court. They don't have to tell the defense everything they know, only what they intend to use in court.
In other words, if they don't plan to, and don't bring it into court, they aren't breaking any rules not telling the defense about it.
as to the jury, its made up of people, who, no matter what they say about being impartial, do have personal concerns worries, fears, and sometimes political agendas. Its a sad fact that sometimes, there are people on juries that will vote either way not based on the evidence or anything other than just getting it over with so they can get out of there and go back to their regular lives.
which brings up another question, at what point does making threats move from protected free speech to becoming a criminal act? And, if its directed at the jurors, isn't that also attempted jury tampering as well??
Doesn't matter what the verdict is or even if there isn't one, the wackjobs on one side or both are going to use it as their excuse to cause trouble.