I think this was a crime of retribution/retaliation or the crime of predator. The lack of communication is telling.
Not only that but the scene inside the home indicated a homicide investigation.
Maybe the perp(s) knew there was to be no need for communication or demands.
As far as I can tell, there was no signs of a forced entry.
So there was planning. Get inside in an orderly and quiet fashion ... disable/disconnect the doorbell camera at 1:47.
This wasn't a hasty crime of opportunity. This was planned for the middle of the night.
The camera software suggested something moving in front of it at 2:12. Unknown whether human or animal.
Ms Guthrie had no security subscription or monitored home security system. Video was not saved to the cloud.
At 2:28 her heart monitor app disconnected from her phone. Likely that is when she was removed from her home.
How could someone have gained entry without forced entry in the middle of the night?
Did she know the perp(s) and let them in?
She had arrived home about 9:48 the previous evening.
At about 9:50, her garage door opened and closed.
Did someone have a universal garage door opener, guess the code, get in and found a door unlocked from the garage?
I might imagine someone cruising a neighborhood to see which garage doors they could open with a device for hacking.
... and found one.
Unfortunately, I think we may never know what happened, unless someone makes a mistake, caught in a similar case or gets ratted out.
Apparently she didn't take home security seriously at 84, with limited mobility and living alone. Sad. Very sad.
All that said, one thing that's tripping me up is the fact that the perp(s) removed her from her home but there was apparently a homicide scene inside. Why remove her if she she was deceased? And if she was alive when she left her home, why is law enforcement treating her home as a homicide scene? So many unanswered questions.
EDIT: Well now I see a report that law enforcement handling the investigation is not saying whether there was or wasn't signs of forced entry. It's one of the details they are not commenting on at this time. And the investigative narrative seems to indicate that the opening and closing of her garage door was done by her although they didn't specifically say that. So maybe never mind. Dunno.