I think he was shot in the head when he was in the shower. I have no doubt that he lunged at her when she pulled gun on him. He probably managed to turn her hands enough to deflect the bullet a little, so it went through the side of his head instead of his forehead. I think he caught himself on the sink (thus the blood) and then fell to the floor - as Jodi described. I suspect that he was crawling down the hallway, towards, the stairs, hoping to at least roll down the stairs and go for help. I think that Jodi was stabbing him in the back the entire time until she got him at the top of the stairs (bedroom entrance), where she slit his throat and then dragged him down the hallway, back into the shower. Then she tried to flood the place to hide the evidence. I think that the camera was on the bed and she had deleted the photos, but she put the sheets in the washing machine and accidentally put the camera in too.
She has told a big, ugly story, one as elaborate as that of Casey Anthony with her mother (about her job as a Disney promotion girl).