I truly am sorry you feel those of us sleuthing out all the people involved in a case is despicable, I disagree.
Of course the husbands car is being looked at, If I were LE he'd be my prime suspect right now and I'd be looking at EVERYTHING of his. We don't know that the sisters car hasn't been checked, or won't be...not everything is reported/released to media, and that is where we get most of our info.
Of course the husband is being finger printed, as I'm sure the sister was and I'm sure others and more to come.
Of course the police are talking to the husband, I am SURE they are also talking to the sister and every other Jane, Dick and Harry that the deceased knew, especially the sister, who was the 1st on the scene.
As far as the husband running of in the middle of the night, I am understanding, correct me if I'm wrong, there was company at the house until 10:30....I don't remember, what time did the husband say he left? Was it in the middle of the night?
Of course the husband lawyered up, I woulda.
Now.....we have NO idea what evidence at this time the police have, correct? Tell, what evidence at this time can be gathered that has been released? What do we know for sure at this point? Concrete and circumstancial? (<--did I word that right?)