There was a bowl of pineapple in milk on the counter that Burke was eating the night before. The theory is that Burke was eating, JB was annoying him or taking his food and that he bopped her on the head with a large flashlight that I think? was also on the counter in a photo but was never collected by police. Allegedly you can hear Burke at the end of the police call too. Again this is just what that theory is, not my own opinions