I've been out of touch for a while but
@PommyMommy alerted me to the updates on this case. I don't know how much of the discussion about SW I believe--how do you straddle someone for 20 minutes and have a conversation? IMO, parts are true. I think he had been thinking about killing SW at least for a while. He had a lot of built up resentment towards her. It's chilling that he said that this had all pent up from the wedding--that's a long time and a lot of resentment. I don't think his resentment was warranted--she was just trying to living her life the way she wanted. But resentment is powerful and probably had him thinking about killing her for a while. I think believe that he hadn't fully planned this and the conversation, however it happened, probably was the ultimate trigger.
I'm still on the fence about whether or not he planned to kill Bella and CeCe or only did so because they saw what happened. It breaks my heart that they knew what was going on, especially Bella, who had to see both her mother and her sister die. I'm glad he hears Bella every day-I hope she haunts him for the rest of his life.
Anyway, my two cents on the developments. He's told so many different stories at this point that it's hard to know what to believe.