overall, he tries to be discreet, but i can't imagine that it's been a perfect kill every time, because sometimes you're in a hurry and leave something behind, sometimes the body you leave in the bayou pops back up unexpectedly, or someone you think won't be missed really is. or maybe someone got away because ari was interrupted? he, evanthe, ziggs, and aug have a musical thing going on, that ari and evanthe occasionally use as a cover for hunting and pick people out of the crowd, so if you'd prefer something more recent, one of the victims of that could have been someone vaguely significant or whose family turned to lucky?