First-time poster from Colorado here…please bear with me if I’m not caught up on the details.
Initially I thought this was about KB planning to move back to WA state and take her daughter with her, thus denying PF access to his daughter. If the relationship had soured, I can understand KB wanting to be closer to family support. However, that scenario doesn’t make sense, given that she just purchased the house three months ago. Buying a house indicates that the relationship may have been ending, but she planned to stay in the area to facilitate shared custody of the baby. I now think this is simply about his control and rage: she ended things and he couldn’t tolerate the rejection. The timing certainly suggests this, because PF began planning her killing three months ago, right around the time KB bought the townhouse.