Furiosa: A Mad Max Saga‘s closing arc walks through all the potential ways in which Dementus is believed to have died before disclosing the truth behind what Furiosa did to him. Almost throughout Furiosa‘s runtime, the Anya Taylor-Joy character’s journey is marked by a series of brutal confrontations in which she loses several loved ones and one of her arms. However, in Furiosa: A Mad Max Saga‘s ending arc, she finally gets the opportunity to make Dementus pay for all the suffering he mindlessly inflicted upon her, Jack, and her mother, Mary.

https://screenrant.com/furiosa-dementus-death-stories-explained/