In all of the cases and lead up to the cases involving LVD, AC, and Chad, has any legal expert addressed the possibility of federal charges against LVD and Chad for conspiring to kill witnesses (Tylee, JJ) to the murder of Charles to prevent their disclosure or testimony? The murders of Tylee and JJ ensured that there would be no witness disclosures or testimony from either of them. The only witnesses that might remain to speak on their behalf would be hearsay witnesses - in JJ's case that could possibly include witnesses among staff at his school who'd seen his behavior and heard anything he might have said at school after CV died and in Tylee's case may possibly include friends to whom she may have disclosed details or concerns.
I recall that JJ had begun acting out or acting contrary to his typical self at his school in Arizona (Lori explained by lying to them that CV had died of a heart attack) and wonder if JJ was doing the same at his school in Idaho after they moved there and that is why LVD took him out of school. (ETA: I also recall that LVD had hired a "babysitter" in Rexburg who was hired to be an ongoing nanny/babysitter, but who LVD used to watch JJ only once before she terminated the relationship. And that babysitter had reported JJ acting out in some way during that one time she watched him.) And I recall him exclaiming something like, "Get the hell out of here," before running after his friend when seen on RING video playing in the courtyard of the Rexburg apartments where LVD had moved herself, Tylee, and JJ. So, I think it probable that JJ was in the home when at least the first shot was fired into CV and was commanded to get out and into the car (probably with Tylee) by either LVD or AC yelling, "Get the hell out of here" (which made such an impression upon JJ that he was compelled to repeat it in play).