A lot of people died at the Alamo, especially considering it was a fortification that wasn't supposed to be manned at all. It was only when Col. James Bowie arrived at the Alamo to remove the guns did they realize its strategic importance. Sadly, this didn't translate into Gen. Sam Houston providing any reinforcements. Some volunteers arrived, however, and among them were some famous names.
But it would not be enough, as the garrison was heavily outgunned and outnumbered and the Mexican Army was not taking prisoners.
William B. Travis
The original artist of the now-famous "Line in the Sand," Travis straight-up told the defenders of the Alamo that they were all that stood between Santa Anna and the rest of Texas. After telling the Alamo's men no reinforcements were forthcoming, he drew the line with his sword and told those who were willing to stay to step over it. All but two did so. Travis was supposedly hit in the head by a Mexican round early in the assault on the Alamo.
The legendary frontiersman and former U.S. Congressman departed the United States for Texas because of his direct opposition to many of then-President Andrew Jackson's Indian policies. His presence at the Alamo was a good morale boost for the outnumbered Texians, but it would not be enough to prevent them from being overwhelmed. During the assault on the Alamo, Crockett and his marksmen were too far from the barracks to retreat there, and were left to their own devices as Mexican soldiers swarmed around them.
Bowie was a legend among Americans and Texians long before he started fighting for Texas independence. He had already led Texian forces on two occasions before coming to the Alamo. During the siege, Bowie was actually bedridden with fever and likely died in his bed, fighting Mexicans with his pistols.
Autry was a War of 1812 Veteran who fought the British in the Southern United States. He roamed the new country for a while, finally settling in Louisiana after quitting farming to become a lawyer. When the Texas Revolution started, he raised a contingent of men from Tennessee to march to the Alamo from Louisiana.
Bonham came to the Alamo with Jim Bowie because of his growing discontent with U.S. President Andrew Jackson's policies. Bonham himself raised a troop of Alabama militia to join the Texian revolutionaries. It was Bonham who rode out of the Alamo to look for more men and material to support the defense of the fort. Three days after he returned, he was slaughtered with the rest of the defenders.