 He goes to the top of the north tower and finds Frollo there.Quasimodo notes Frollo's demented appearance and follows his gaze, where he sees Esmeralda in a white dress, dangling in her death throes from the scaffold.After Quasimodo pushes Frollo off the tower in a moment of rage, it is all but explicitly stated that he tracks Esmerelda's body to the mass graveyard where she was left after her execution and starves himself to death while embracing her corpse.