Matthew Itkowitz, an off-duty deputy U.S. marshal, was being beaten and threatened with a gun in an alley off Melrose Avenue when, in fear for his life, he managed to draw his own weapon and fatally shoot his attacker. At least, that's the story Itkowitz told Los Angeles police. What really happened that night in the Fairfax district is less clear-cut. Man in the red shirt is the U.S. Marshall