A man who severely beat a San Francisco Giants fan outside Dodger Stadium has pleaded guilty to a federal weapons charge. Marvin Norwood pleaded guilty Thursday in Los Angeles to being a felon in possession of firearms. Norwood, 34, and Louie Sanchez, 32, were sentenced to state prison for the 2011 stadium attack that left Bryan Stow with permanent brain damage. Federal authorities arrested Norwood when he finished serving time in the beating case.