He died after three years on the 15th of Shaban 329 A.

He died after three years on the 15th of Shaban 329 A.H.[^22] The graves (tombs) of these four respected deputies (Nawwab al -Arba, as they are commonly known) are situated in Baghdad.[^23] The most sensitive and crucial period of ghaibat al-sugra was when Ali Ibn Mohammad died. Because till his death the people were is contact with Imam az-Zaman (aj) through him. After his death, it was the commencement of Ghaibat al-Kubra.

Six days before his death, Ali ibn Muhammad Seymoori received a communication from Imam az-Zaman (aj): "...so be prepared, but appoint no one in your place, because from the day of your death, the period of my major occupation (Gaibatui Kubra) will begin. Henceforth,