He was known to be a hothead and have a violent temper. If I remember correctly a neighbor heard the couple arguing at some point that evening.
Discounting that though his version of events just isn't credible. He's in bed with his girlfriend. He wakes up. She isn't there, hears a noise in the bathroom, supposedly thinks it's an intruder and fires a load of shots through the door. Utter bollocks. He's had a row, she's fled and locked herself in the bathroom and in a fit of rage he's followed her and unloaded the gun through the door. Murder.
I mean come on, he wakes up and his girlfriend isn't in the bed. Unless she's fucked off she's probably in the bathroom. Where else did he think she was? He wouldn't think anything was abnormal about hearing somebody in the bathroom if she wasn't in the bed. If she'd disturbed an intruder there would have been a struggle and screaming. There wasn't. The only defence he had and it would be a slim one, was he'd shouted out to her numerous times but there was no answer. He couldn't see her but the bathroom door was locked. Even then you'd call the emergency services in case she'd passed out in there, or try and break the door down. You wouldn't go all Rambo on the bathroom, it's insane.
