How is fortunato killed in the cask of amontillado?

In "The Cask of Amontillado", Fortunato is tricked by the narrator into going down into the passages underneath the narrator's home to test the quality of a cask of Amontillado (wine). Along the way, the narrator gets Fortunato so drunk that when they reach their destination, he is too unaware to defend himself. The narrator had prepared ahead of time and Fortunato finds himself chained to the wall in a passageway, and there he must stay as he watches the narrator pick up mortar and bricks that were placed there ahead of time and slowly build a wall in front of Fortunato. When the wall is finished, he is left down in the new room to die.