I'm obsessing now.
I'll tell you my predictions.
After watching the person keel over on the beach, I'm pretty sure it's Tyler. I kept rewinding it, trying to make out who it might be (it's around the 30 second mark of the pilot to anyone interested) and that is my hunch. They show Jack moving the body but I don't think he's the one who did it. I'm guessing maybe Ashley or Daniel himself. I can see Daniel killing Tyler and then Jack trying to cover it up for Emily's sake. I think Daniel on trial and possibly being sent away to prison would be an excellent juxtaposition the whole series is based on. David Clarke was tried for murder and sent to prison. This could have been Emily's entire plan, to make Victoria go through that much like Emily had to do with her father. In that case, Daniel wouldn't be guilty but Emily could have set him up to take the fall for Tyler's murder.
Then again, it could be Daniel that was killed and that blows my whole theory out of the water.
Either way, I love revenge. And "Revenge".