Two thoughts. One, Witness may have seen vehicle and person parked in area at other times. We are all creatures of habit,I use that exact same spot to park every time I go to the store. Don't ask me why! There are a large amount of satellites up there rotating earth once every day, like the moon, or they would fall to earth I think from physics classes. Maybe they got a shot from one of these private satellites and found a vehicle there at that exact time on that day. With new info, gave that witness account new priority??? Two, maybe they have been making repeated attempts for a DNA hit to registries and as those sites became more popular over the last two years, got a recent hit close to their population, so the investigation turns local???? I am just guessing as so many of us are so affected by this crime, I would imagine investigators with inside knowledge would be utterly invested as it is not only so heartbreaking but it is their job, so their efforts would be outstanding and ongoing I would think.