ddt
Mafia Penguin
His story was that he didn't know it was locked and thought the occupant was about to leave it, putting him in danger. The prosecution couldn't prove otherwise.
In order to confront the "intruder", Oscar had to go down from the bedroom through a narrow passageway, then make a 90 degrees right turn, and make another right turn to stand in front of the sinks where he shot. That means that the "intruder", in order to be a danger to Oscar, would have had to scale the same maze. Oscar would have had ample time to be alerted that the "intruder" would move his way.