Both, personal and a complete stranger can overpower one. If one is caught by surprise, from behind, it can render you helpless with little struggling.
In Nancy's case I would like to know if LE thinks she was strangled manually or with a ligature (garrotte). There were no signs around her neck, except the mark on her neck. The hyoid bone was fractured, that happens frequently with manual strangulation. We just don't know.
Her body was free of any visible marks, no trauma noted, I know she was decomposed where some bruising could not have been noted.
Given the intense scrutiny on Brad Cooper, I wonder if the police are theorizing he assaulted her while she was asleep. How did he get her out, how come the kids didn't wake up and see anything, someone would have had to come over to make that phone call if she was deceased. Mike Hillers affi has info in it that one could reach the conclusion that CPD is investigating an accomplice theory.
The phone call from Nancys phone that morning to me is key, and of course TOD is in range she was reportedly missing, now we have a witness that has forward, and there was another lady that someone posted about who claimed they saw someone of Nancy's description running around 8. I wonder how many other unconfirmed sightings were reported that we do not know about/