Montresor discusses how he is upset with Fortunato and seeks revenge. In the exposition it also introduces fortunato as a wine taster, and the enemy of Montresor, but Fortunato seems to be completely oblivious that he is Montresor's enemy.
Montresor is insulted by Fortunato, and he vows his revenge. Montresor finds Fortunato at the carnival celebration. After tempting him with the story of Bottle of Amontillado.
Montresor leads Fortunato down to his wine cellar, Fortunato does not know he is being lead to his death.
goodbye old friend
Montresor trapped Fortunato into a room, and chained him to a wall.
Fortunato stops screaming, and Montresor only hears the jingling of the bells on his costume when he throws his torch into the catacombs. Montresor also is finishing sealing the wall he is making in front of Fortunato, so one finds him.
so long sucker!!
Fortunato died in that room, with no one to help him, Montresor killed Fortunato.