I get what killed Hackman. 95 years old, lots of previous heart trouble.
I do not buy the story that his wife Betsy died solely from Hantavirus. Like pneumonia or any other respiratory virus, the onset is marked by flu-like symptoms. No one interviewed who had interaction with Betsy that day and the day prior noticed any signs of sickness. You simply don't drop dead from this virus, like out of the blue. There's a steady decline, marked by serious symptoms which would surely motivate her to get medical help. If Betsy was deathly ill, she would not have been running errands the morning she supposedly died. If Betsy had a serious heart condition, maybe, but the autopsy did not reveal heart disease. According to the CDC, "Most patients experience progressive evidence of pulmonary edema and hypoxia, usually requiring mechanical ventilation".
It seems that an awful lot of folks buy into this, without researching the disease.
Also, keep in mind that this is the same Sheriff's Dept. and lead investigator that completely bungled the Alec Baldwin/Rust investigation.