Boromir, Denethor's son, dies after trying to take the One Ring from Frodo.
At Amon Hen, Boromir succumbs to the Ring's influence and urges Frodo to give it to him for Gondor's defense. When Frodo refuses, Boromir attempts to seize it. Frodo escapes by putting on the Ring, and Boromir immediately recognizes the betrayal and regrets what he has done.
Soon afterward, a company of Orcs attacks. Boromir redeems himself by defending Merry and Pippin, standing against the attackers until he is mortally wounded by arrows. Aragorn reaches him before he dies, and Boromir confesses his failure while urging Aragorn to protect Gondor. His companions then place his body in an Elven boat and send it down the Anduin in a funeral rite.
The episode is sometimes remembered as though Boromir dies during the attempt to take the Ring. More precisely, he survives that confrontation, repents, and dies while defending the two younger hobbits. He is Denethor's elder son and Faramir's brother, not Faramir himself.