Too many aspects of his version of events are just too far fetched to be true. I recall his reaction at the Olympics when he got beat by a bloke who's name escapes me. He looked like a nasty aggressive piece of work with a foul temper when he didn't get his own way. As said above, the girl locked the door, which she'd have no reason to do except try and protect herself from him. Unfortunately for her it was probably the thing that tipped him over the edge and got her shot. But anyway, whether he shot her deliberately or in a rage or whether he thought he was shooting an intruder is irrelevant, the fact is his action was extreme and was murder.