Captain of the Orcs of the Tower of Cirith Ungol. Shagrat was a large Uruk with an evil face and protruding fangs and long arms.
In 3017, Shagrat was ordered to allow Gollum to escape when the creature was released from the Dark Tower. Shagrat's guards saw Gollum again in March of 3019 and they surmised that he had brought prey for the Great Spider Shelob who lived in a tunnel near the pass.
On March 13, Shagrat received a message that spies might be on the Stairs of Cirith Ungol. He led a company of about 40 Orcs to investigate. The met another company of over 80 Orcs led by Gorbag from Minas Morgul. Then Shagrat saw the body of Frodo Baggins, who had been stung by Shelob. Shagrat knew that Frodo wasn't dead but only unconscious, for he was aware of Shelob's method of feeding on warm blood.
Shagrat was pleased that they had caught one of the spies - though Gorbag warned him that there was another spy on the loose. Shagrat's orders were to keep any prisoners alive and unharmed and to strip them and send a full inventory of their possessions to the Dark Tower. Shagrat had Frodo taken to the topmost chamber of the Tower of Cirith Ungol, where he questioned his prisoner mercilessly. When Frodo's clothes were removed, his mithril shirt was discovered and Gorbag coveted it. Gorbag knifed Shagrat in the arm, but Shagrat strangled Gorbag and left him for dead. The Orcs of their two companies fought and killed one another until nearly all of them were dead.
Shagrat strangled Radburg and sent another of his subordinates called Snaga to bring news of what had happened to the Dark Tower. But Snaga encountered Sam Gamgee on the stairs and thought he was a Great Elf Warrior and refused to go back down. Shagrat chased Snaga but he got away. Then Shagrat discovered that Gorbag was still alive, so he stabbed him. Shagrat decided to go to the Dark Tower himself, but as he went to the stairs, Sam leaped out at him wielding the glittering Elf-blade Sting. Shagrat pushed past Sam and escaped from the tower and Sam let him go.
Shagrat brought Frodo's mithril shirt and Elf cloak and Sam's sword to the Dark Tower on March 17. These tokens were shown to the Host of the West by the Mouth of Sauron on March 25 as proof of Frodo's capture, causing great grief among Frodo's friends.