Thanks for all the great inside skinny!!
More:
It appears that they've found two of the getaway vehicles--his mother's Cherokee and a Hummer. They're looking for a Silver Ford Explorer.
They won't release the name of the vic they found at the other end of town, but they say the murder victim is related to Mack, so Mrs. randog and I are assuming it's the ex. The apartment complex is pretty upscale.
In high school, the Macks were part of the "elite", i.e. they had money. No matter--a bum deal in divorce court can enrage a rich man just as much as a poor man.
Assumption: Darren got taken to the cleaners in divorce court and he's going out in a blaze of glory.
Outside Prediction: they'll find him at the summer house at Tahoe/Donner.