I would fully expect FBI labs be available in this case. There ways to kill that make it hard for pathologists... but they look a lot deeper when a case is suspicious. The first clue is that the H.S. educated coroner ruled it as natural causes. A goofy vague term that should be eradicated in our modern day. The most "natural" cause of death in the usa is cardiac arrest. But cardiac arrest can be triggered by myriads of things. Electric shock for example... prescription and OTC meds, anaphylactic shock, liver/kidney failure (induced by toxins, which could be wide ranging from natural plant substances, insect/snake/frog venoms, drugs, industrial chemicals, vast possibilities). There is no doubt in my mind that AxC had access to any and every possible means. They may have suffocated her or used carbon monoxide. A lot of things leave no obvious signs. Read some books on witchdoctors, shaman, ninjas, professional mercenaries and methods are endless. Yet pathologists have a process of elimination system to rule out whole groups of possibilities. Its also possible to scare someone into a cardiac event - try proving that in court. AxC used a Taser on TR's father, maybe he had one that didnt leave marks. Repeatedly tasering someone can trigger a cardiac event. As for AxC's own death, I think #1 is drug OD. #2 If it was an unusual toxin, then I have ideas about that. #3 if both TD and AxC died from the same substance that would sure be interesting.