Answer: “The Battle of the Alamo was a pivotal event in the Texas Revolution. Following a 13-day siege, Mexican troops under President General Antonio López de Santa Anna reclaimed the Alamo Mission near San Antonio de Béxar, killing the Texian and immigrant occupiers. Santa Anna's cruelty during the battle inspired many Texians, both legal Texas settlers and illegal immigrants from the United States, to join the Texian Army. Buoyed by a desire for revenge, the Texians defeated the Mexican Army” (via Battle of Alamo wikipedia)
i think the answer is he died assassination by firearm and the reason for his death was his killer was angry at him for advocating unity between India's Hindus and Muslims
