Just some of my thoughts - in no particular order of importance:
Have heard nothing about brothers activities that day other than he was "coming and going"; where was he coming and going to? Nor have I heard anything about any of his friends.
Things aren't looking good for SA. But I did have another thought: he had a "blow-out" at work? With whom? Did someone seek revenge on him by getting Hailey?
And for some odd reason, Im disturbed about dads GF. Jealousy can make people do horrendous things. Could there have been an issue there? New mommy - drastic hormonal changes - lack of sleep. . .
I also have a feeling that numerous "key people" are using recreational drugs. Snooping around social networking sites, seeing pics on their friends profiles depicting weed and pipes. Friends usually hang with people with similar interests and doing activities they enjoy doing, together. =(