Can we quote CNN as a legit source? Per this interview this a.m., per Joseph Scott Morgan, "Distinguished Professor of Applied Forensics, Jackson State University,"
"This is a multiple death scenario. This is not common. Particularly...I worked for the M.E. in Atlanta, I worked for the coroner in the New Orleans area, and... in my recollection, I've never worked a case with multiple deaths in a single structure that weren't either trauma-related, or there was some type of toxin in the air, or something that had been ingested. And then, on top of this, we have this dead canine as well, that was found adjacent to her in the bathroom...."
FOOD FOR THOUGHT. I still lean towards Betsy having a medical event first, without there being anything in the air/or food (toxin).
If there was some kind of toxin in the air/or ingested, would it be accidental or purposeful? edit: these are my thoughts of what may have happened.
1. accidental death of Betsy due to a medical event. Betsy's perishing leads to Gene's death
2. Accidental death of Gene, which leads Betsy to have a medical event and die as well
3. they both were overcome by something in the air/or ingested, but it was accidental
4. they both were overcome by something in the air/or ingested, but it was purposeful (homicide)
5. homicide (strangulation, suffocation, injected with sux, etc.) but staged to look like an accident.
As stated before, I lean towards the dog's untimely death as a red herring, as he would've died without water after a few days of being crated. Although, if it was something ingested/in the air, he may have perished at the same time.