Protestors hold up signs outside the courthouse before the arraignment of New York City rookie police officer Peter Liang Wednesday, Feb. 11, 2015, in New York. Liang, who fired into a darkened stairwell last November at a Brooklyn public housing complex, accidentally killing 28-year-old Akai Gurley, was indicted by a grand jury in the shooting. He surrendered Wednesday to face criminal charges. (AP Photo/Seth Wenig)A dozen protesters stood outside the courthouse before the arraignment of Peter Liang in New York, Wednesday, Feb. 11, 2015. Liang, a New York City police officer who fired into a darkened stairwell at a housing complex, killing a man who had been waiting for an elevator, surrendered Wednesday to face criminal charges. (AP Photo/Seth Wenig)