OAKLAND, CA - JANUARY 14:  Oakland Police officers arrest a man following a demonstration for slain 22-year-old Oscar Grant III January 14, 2009 in Oakland, California. Twelve days after the fatal shooting of Oscar Grant III, former Bay Area Rapid Transit (BART) police officer Johannes Mehserle was arrested and charged with murder for shooting Grant in the back as he lay face down on the ground following an altercation on a BART train. Getty Images logo Getty Images 10 months ago

OAKLAND, CA - JANUARY 14: Oakland Police officers arrest a man following a demonstration for slain 22-year-old Oscar Grant III January 14, 2009 in Oakland, California. Twelve days after the fatal shooting of Oscar Grant III, former Bay Area Rapid Transit (BART) police officer Johannes Mehserle was arrested and charged with murder for shooting Grant in the back as he lay face down on the ground following an altercation on a BART train.