My wife thinks it was an accident, but the family got together to try to cover it up. Casey and boyfriend or whoever were at home, they had looked up chloroform, maybe a week previously, to try to put her to sleep for a few hours so they could lock the house and go party a few hours. It probably backfired(obviously), they couldnt wake her up. They freaked out and called mommy and daddy. They came to help cover it up. A hair that had "hair banding" on it(which happens to hair after death), was found in the trunk along with traces of chloroform, and decaying matter which didnt absolutely mean human decay. there were only like 5 key elements found out of 400 total to match to human decay. The science of it is long and painstaking. Then they dumped the body to cover it all up. It all sounds horrible and gruesome, and why would someone do that. But it's the only thing they though they could do to get out of it all.I couldnt speak for them as to why they couldnt just get a babysitter instead of chloroform, thats just crazy to me but. Maybe watched one too many CSI's or something. AGAIN, just a theory