Death Stalks Gilgamesh

How does catharsis relate Gilgamesh's realization of his own mortality? What prompts Gilgamesh to confront his own mortality?
            Catharsis relates to Gilgamesh's realization of his own mortality because, catharsis can be a state of moral renewal. Gilgamesh's relationship with Enkidu helps him to eventually reach a state of catharsis. Enkidu helped Gilgamesh to realize that he was human, Enkidu was his one true companion and friend. Enkidu taught him how to be kind, he also taught him to help others instead of himself. However, it was only after Enkidu's death that Gilgamesh reached a true state of catharsis.
            After Enkidu's death, Gilgamesh felt true pain. He grieved for his companion, Gilgamesh even said, "My cheeks are hollow and my heart is heavy because my brother is dead. Enkidu, my beloved companion, is dead". Enkidu's death made Gilgamesh realize that one day he too would die. Enkidu was a brave, kind, and young man however, he faced death; Gilgamesh feared that he would have the same fate. Gilgamesh feared death, he wished to be immortal, he did not want his time on Earth to ever come to an end.