It's been said that Two-Face is one of Gotham's biggest terrorists and murderers, but I really don't think so. The only time that I remember Two-Face killing was during the Prodigal storyline, when Dick took over for Bruce as Batman. Two-Face killed one of his henchmen because he wouldn't shut up and kept questioning him (It was actually pretty funny, because next issue he was talking to him.). His gang also killed a roomful of lawyers, but I don't believe that Two-Face killed any himself. I know that he killed Jason Todd's dad, but did that get retconned out? He's certainly taken a few people hostage. Have there been other times that he killed anyone? If so, who, and when? Thanks.
Without poring through seven decades of appearances, I can assure you that Two-Face has gunned down a number of people, being a violent and psychotic gangster. Plenty of stories have shown him murdering a subordinate or a crime victim to illustrate the coin-toss gimmick, to give you one broad class of examples.