Heney prosecuted Mayor Eugene Schmitz and political boss Abe Ruef for bribery. While examining prospective jurors Heney had publicly revealed the fact that one man on the panel, Morris Haas, was ineligible because he had many years earlier served a term in San Quentin Prison. Heney did not need to humiliate Haas publicly in this way; he did so in anger, believing that Ruef was trying to plant the man on the jury. Haas deeply resented Heney's action and brooded over it for many weeks. While the trial was in temporary recess, Haas approached Heney in the courtroom, whipped out a revolver, and shot the attorney in the head; the bullet lodged behind the jaw muscles, where a difference of a fraction of an inch in any direction would have produced a fatal wound. Heney was carried away on a stretcher, mumbling, "I'll get him yet." His place was taken by a bright young assistant named Hiram Johnson, and the trial went on.