Quite possibly. But then, that means the killer has learned to identify, not the victim's vehicle, but the victim's husband's. And anticipates that the husband will leave for work at a very particular time, but the victim won't. How did the killer know S wouldn't be staying home to run the garage sale, along with Liz?From the either school's parking lot, it is possible to view vehicles that pass along Kuykendahl Rd.
JMO