Before his death, Freya was able to transfer his soul into a pendant. Elijah was later on restored to his body. However, every vampire in his sireline remained dead. In the series finale, Elijah chose to die once again alongside Klaus when his brother sacrificed himself to destroy the Hollow once and for all.

How did Elijah Mikaelson die?

Last we saw her, The Hollow (still in Sofya's body) had kidnaped Elijah and infected him with the thorns born from Marcel's venomous blood, setting into motion the final steps to her resurrection. In "Queen Death," Elijah died on The Originals, allowing the Hollow to come back to life.

What kills Elijah?

Alaric kills Elijah with the dagger.