The whole truth has not come out yet.
However, here is what we know from Chapter 35 of "Looking for Answers"
Then he read the report. It did not contain photographs, which made it still incomplete, but nonetheless there were toxicology reports. No sign of sexual activity, no drugs in his system, no signs of a struggle, no bruises. He read quickly, scanning for the thing he needed so badly to know. Massive injury to the back of the skull, caused by large blunt object. A wrench, a hammer... something. Not a facial, jaw, or neck injury.
Zucchini11 called it, and gets the "false confession" award. Now I would have thought you guys would be on the alert since the false confession of John Mark Karr on the JonBenet Ramsey case.
Too bad those readers who decided to stop reading didn't wait for the rest of the story.