11 blows to the head? That sounds more like anger than robbery. I’d be suprised if it ends up being a home invasion murder and not a domestic. We will have to wait and see.
Here’s a little clue (I also watched a couple of law and order episodes), no release about the suspects yet they are diving in the lake. If a witness saw someone throw an item in the lake or if they think the weapon was disposed of nearby, or if a strange vehicle was seen at the house, that’s good info to release, more witnesses may come forward. The less they tell, the more they already know.