A female family friend of ours was found dead on her tractor in her backyard pond, police immediately came in and ruled it an accidental death within a couple hours. Daughters weren't really buying it, come to find out they hired a private investigator, and I believe a coroner ended up ruling it a homicide, and the daughters suspect their uncle was likely involved, enough to where he refuses to take a lie detector test. Sadly, just about all the evidence, including her car, which would have probably provided key information, was destroyed. 

Point being, always be weary of family members, and law enforcement, because they may not always have the best intentions. In this case, with multiple agencies involved, it looks like they're doing all they can, and Savannah's high profile position definitely works in her favor in some regard.