Purity: Recitation in Congregational Salat al‑Mayyit
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 599:
Someone who performs salat al‑mayyit in congregation must also perform the takbīrs and recite the duʿāʾs even if he is a follower in the prayer [as opposed to being the imam of the prayer].
-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)