Back from the police

Today I went to the police, It took a bit of Q&A but eventually the chief there showed me what he could find.
I assume part of the reason I finally got some information is because my parents are close friends with the chief.
Unfortunately he did not allow me to get a photocopy of any of it as I was not suppose to have seen it in the first place.
Here's what I learnt:
The case was kept very quiet, not many people knew about it and there was next to no media coverage on it.
As far as anyone could figure it was just another random murder case.
However things got weirder as the chief showed me the coroner's report of the young boy(Who was known as Bradley Murphy, I think I forgot to mention this earlier)
It claimed that the cause of death was due to blood loss, Though I do not quite remember specifically what the specific term for that was, The cause of the loss of blood was listed as deep sharp wounds which appeared to be inflicted by a wild animal, With the boy having half of his face clawed off.
Police reports suggested that the parents probably found the children dead, tried to hide then and ran away. But this still doesn't explain the pentragram.
Another theory suggested that they were satanists that were trying to perform a sacrifice, but this theory was simply tossed aside.
The case was never solved.

In response to whoever asked for a highlighted photograph, don't mind my crappy highlighting.
It almost looks like it's had it's face clawed...
I have a feeling that there's more to this than i'm seeing, I refuse to accept that the parents simply ran away.
I must discover what really happened, perhaps there's more clues at the house.