The knockout angle is an interesting one, but as far as I know that's an inner city thing, and in any event I have a hard time believing that teenagers sucker punching a girl would bother with moving her body. Typically when those are fatal the attackers don't know, they just punch someone and take off, the consequences of their attack not even remotely on their mind.
I think if she was in fact beaten to death it was pre-meditated murder, because of the body being moved. Alternatively, if there was water in the area then she might have been forcibly drowned (which would immediately suggest homicide) or if she were strangled their might be skin / DNA under her fingernails, something that suggested she fought back.
I think if she was in fact beaten to death it was pre-meditated murder, because of the body being moved. Alternatively, if there was water in the area then she might have been forcibly drowned (which would immediately suggest homicide) or if she were strangled their might be skin / DNA under her fingernails, something that suggested she fought back.