What? No, Irons found the mayor's daughter wounded and brought her body to his office to try and save her. There was nothing he could do, so he just sat on his chair and prayed for her, until Claire interrupted, and that's why he's so mad at her!
Nah but really, he has hidden all of the ammo, blocked some passages, and even had (SPOILERS IF YOU?RE NOT HERE YET) a torture chamber. In TDC, you find Irons in his secret room with the mayor's daughter in a torture table. I think he even has something like a saw in his hand. Actually, I think there were some rivalries between the mayor and Irons, and that's why Irons was having fun with the girl's corpse. Maybe it was like some sort of revenge to him. From the Secretary diaries, I believe he also had fun with her in his secret chamber (she wrote that she found the existence of the chamber, so maybe he used her as a his next victim for her not to reveal the truth).