I believe, the premeditation started no later than when the girls went on a "camping trip" in the middle of Corona, so a few days before Wednesday at least. School holidays were not at that time, if I am right. Did the extraordinary vacation have to be applied for from the HS of the minor daughter? What might the alleged reason for the application have been?
I can imagine, BM wanted to clear some severe problems (financial probably? much worse??) with Suzanne and planned to get his will, whatever it costs and be it the life of his wife. The girls had to be away at a safe place, not able to return untimely. Maybe, they were at a relative's home in MI; I think, I saw some connections with MI (business?) time ago. But it's not important at all, where they stayed. I'm though curious to know, if they were sent away more often, when the marriage went down since they all had been in Colorado (like SM's sister now discovered). Did DV happen? Did DV happen only, when the girls were far away and not able to see the physical characteristics on their mum? BM could have shown himself before and after as the nice husband and dad, who couldn't hurt a fly. He even could have told the girls, how he suffered once and again because of their "crazy" mother.
It is so very sad to think, that the marriage got into a downward spiral at the same time, when poor Suzanne became ill. Or the other way around: that Suzanne became ill with cancer, because her marriage was going down. Who knows, what came first.