On Dec. 22, 1984, four black teenagers approached electronics specialist Bernhard Goetz, 37, on the New York City subway. After one of them said, “Give me five dollars,” Goetz pulled out a five-shot revolver and opened fire, injuring all four. Of these, one suffered a severed spinal cord, paralyzing him.

Daniel Penny's martial arts instructor from the Marine Corps took the stand Thursday for day six of witness testimony in Penny's trial. The Marine veteran is accused in the chokehold death of Jordan Neely on the subway last year.