It seems she found out way later. Obviously she came straight back from Vegas for Carlo’s funeral. Then who knows how much longer after the funeral they are packing up the house to move to Nevada when Connie comes storming in accusing Michael of Carlo’s murder.

Surely they had some kind of story cooked up to tell Connie that either Carlo died by an accident or was murdered by other mobsters, etc. How did she just suddenly know it was Micheal?
Does the book go into further explanation about this?