Ugluk

Uglúk was the leader of the Uruk-hai who were sent from Isengard to pursue the Fellowship of the Ring in TA 3019.
The initial leader of the Uruk-hai was Lurtz, who killed Boromir and was slain by Aragorn at Amon Hen. Uglúk took command of the troop after his death, proving himself disciplined by standing by the instructions given by Saruman from the "master". When Snaga's hunger proves a threat to the captive Merry and Pippin, Uglúk reminds him of their importance (and that they "are not for eating"), but Snaga tries to lay hands on them anyway, and Uglúk beheads him.
Uglúk stood by Saruman's demands when a band of Orcs from Moria, led by Grishnákh of Mordor, tried to apprehend Merry and Pippin to take them to Mordor. Uglúk beheaded Grishnákh's follower to prevent Saruman's orders from being disobeyed. The hobbits were taken some way further, but near the borders of Fangorn Forest, an Éored of Rohirrim led by Éomer attacked and routed the Uruk-hai. Uglúk was slain in single combat by Éomer himself during the fighting.