David Cain

David Cain is the name of a comic book character associated with the Batman mythos. He first appeared in Batman #567 (July 1999), and was created by Kelley Puckett and Damion Scott. David Cain is one of the world's premier assassin, taking out some of the most famous and powerful people on the planet, no matter how seemingly impossible the task. He was one of the people who trained the young Bruce Wayne with the skills that he would use as Batman, although Bruce has, naturally, never used the murder techniques Cain demonstrated. When asked why he went to Cain in the first place, Batman replied 'Knowing how to kill doesn't mean you must kill.' Exceptionally meticulous, Cain's success can be partially attributed to his painstaking preparation, always planning far ahead for any contingency: hence his decision to train someone to be his partner and eventual successor. He had made several attempts in the past, training young children, but found every one of them to be a failure. The... full article at wikipedia