I wonder: Under what circumstances - and when - do Federal LE get involved in cases like this? I know the FBI was involved in AZ... but were they running the show, or just providing resources? Obviously the FBI can't respond to every request made by every understaffed or resource-challenged PD and Sheriff's office in every small town in the country. Are the Feds involved in a more significant way in this case now? If not, shouldn't they be?
Given the complications of the case - with now at least 5 or 6 different (relatively small) jurisdictions involved - without some central and very capable and powerful task force providing resources and direction, it seems unlikely that murder or conspiracy charges will ever be brought.
After all, nobody in Chandler really (really) questioned CV's death at the time (maybe for good reason, idk). Nobody in Rexburg really (really) questioned TD's death at the time (maybe for good reason, idk). Nobody in Gilbert seems to have really (really) pursued taking AC into custody or questioning him in the BB shooting (though in my mind there certainly was PC to bring him in - in fact, BB had to hire a PI - but again, idk). And obviously, nobody really (really) questioned JR's manner of death at the time (which, given what we now know about AC...).
I'm not blaming local LE, just saying that now that we can look back and see the number of involved parties, possible crimes, and locations/jurisdictions, the scope of the overall investigation is unbelievably large and complicated. Just compare the potential number of parties, crimes, locations/jurisdictions, and the quantity of digital / IT / SM / technical evidence in this case with that of the Rhoden investigation in OH - an investigation many thought was mind-bogglingly complicated, and one which took several years to complete (the trials may take even longer than that).