As a subject matter expert on comic book lore, I can tell you that in the canonical DC Comics universe, Bruce Wayne's parents, Thomas and Martha Wayne, were killed by a mugger named Joe Chill. The tragic incident occurred in the fictional city of Gotham when the family was leaving a theater. Joe Chill attempted to rob them, and in the ensuing struggle, both of Bruce's parents were shot and killed. This event is pivotal in the Batman mythos as it sets the stage for Bruce Wayne's transformation into the vigilante Batman.

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In that issue, Batman discovers that Joe Chill, the small-time crime boss he is investigating, is none other than the man who killed his parents. Batman confronts him with the knowledge that Chill killed Thomas and Martha Wayne.read more >>