Well, I'm leaning in that direction. The husband's daily routine seems to be pretty much the same everyday. Up early, stop by the restaurant to pick up breakfast for him and the caretaker, then to the uncle's farm. On weekdays he'd probably go directly to his job from the uncle's farm.
It might have been a robbery gone bad. I don't think this was a result of any extramarital affair. It was Valentine's day, they planned to go to the rodeo Saturday night, that was Rebecca's Valentine's gift to Michael.