ETA - the affair/lover theory is JMO
I’m quoting myself here, as my suggestion basically contradicts what I said earlier about it being premeditated. If Barry’s (MOO) murder of Suzanne was premeditated, he wouldn’t have needed to lie and tell her he was going to a work site on the Sunday to cover up actually going to see his lover. If he planned for her to be dead, why would he have needed to make up that story?
This brings me back to being on the fence about premeditation. Maybe he didn’t tell Suzanne about a job site? He had no reason to if she wasn’t going to be alive. Maybe he only told friends and family about the job site after the event, as he was hardly going to tell them that he was with a lover that day?
I still think he made her disappear over the Indiana house sale/the fact she wanted to go back there/the fact he wanted a new life, whether it was premeditated or not, aaaahh!