Seattle....The question that I keep coming back to is why? If it had been a crime of passion, PF killed KB in the heat of the moment, I wouldn't have a doubt about motive, but with the facts that we are currently aware of, I see no logical motive for PF to want KB dead. I do however see a huge reason for KK to want KB dead. I see motive plain as day for KK. That is why I think that KK may be way more involved than is being acknowledged.
IMO KB May have decided that Patrick and her relationship had come to an end. However, the relationship between baby and father would continue on a more formal basis. She may have been ready to move towards a single life (controlled by her not him). She may have wanted to start having a social life, friends of her own, dating, hobbies, church.
No more KB on the back burner, a more structured visitation, baby in daycare. PB did not want the change. Their relationship was probably great for him the way it was. In his mind, she had to go, permanently, if she didn’t comply with his expectations.