I'd have to know more about this other than what they have already "said".
In SC, that wouldn't have been an arrest in the way it seems in this case. If they took the call on the day it happened, took statements, pictures, etc., and were able to get a warrant... then seven days later they located Miller, yes, arrest him obviously.
There has to be a lot more than what is available right now. Doesn't make much sense otherwise.