Anne and jokey, thank you for keeping us up on the details of this case! I know you both must torn between the hope that no one you know is the cuplrit and the need to find who killed this poor lady!
Judging from only what I have learned as an amateur sleuth, the more details revealed in this murder, the more it appears to have been committed by someone who knew the victim well enough to need to be sure she would not survive the shooting.
I think that she knew her killer. If the motive were robbery, there would be no need to attract attention and leave behind oodles of forensic evidence by shooting her four times, all in the head...very loud, very messy, lots of blowback on the shooter. A robber would prefer to hide his face with a mask or hat/glasses or hoodie and intimidate the victim into cooperation...maybe tie and gag her.
Time of death will be interesting, once confirmed. Her husband is the most likely culprit if you go by stats. He is in the position of being closely related to two other women whose murders are unsolved, if local's info can be confirmed. I assume that he did go out of town, but unless his wherabouts at the time she was killed can be absolutely verified, he could have left town immediately after. I am always more suspicious of a spouse who just happens to have left town shortly before the other spouse is involved in some bizzare tragedy.
Can either of you locals find out if her husband traveled regularly, or if this trip was an out of the ordinary occurrance?