Mírzá Muhammad Báqir Bushrú’í was the third Letter of the Living. He was the nephew of Mullá Husayn; according to some accounts, he led the forces at Shaykh Tabarsí after Mullá Husayn was killed and Mírzá Muhammad Hasan was wounded; killed at Shaykh Tabarsí.
“Mirza Muhammad Baqir Bushru’i” Bahá’í Encyclopedia Project. bahai-encyclopedia-project.org
Baha’i World Centre Archives – Door to the House of the Báb