Yes, It's likely not just going off cell tower pings. If either of them had a Google account (and most do) their Google maps timeline is going to be very informative. I'm sure LE has his cell phone and the records but I am not sure if hers was ever found. Likely not though it was last pinged at Cascade Steel. Which is interesting.
This is our town's current murder mystery. I live just a short drive away from Karissa's apartment. This case is a real stumper. A young mother and her little boy go missing from a small, close apartment building. No one heard anything. No one saw anything. LE is keeping a lot of things quiet. Next court date is this Friday. We'll likely hear more then. In the meantime there's a lot of speculation about what evidence they have and whether or not he acted alone. Her family is actively pleading for information from the public and his is laying low.
I am at one end of the case (West Salem) and you are at the other, Yamhill.