OJ walked. Casey walked.
The reality is that the prosecution did a very poor job, they were unprofessional, and the hard evidence was not conclusive enough for a murder conviction.
She may very well be guilt, probably in fact, but the evidence and especially the way it was presented simply did not quite meet the standard of reasonable doubt for first degree murder.
The issue here is that this case has been tried in the media for the last year or so by a bunch of so called experts and media attention whores seeking to make a name and a quick buck off of the pain and suffering of others and emotions are high