Gríma Wormtongue

Grima Wormtongue is a villain in Lord of the Rings. He is one of the more pathetic villains in the series, rivaling Gollum.

In book
Wormtongue was once a man of Rohan, but betrayed them for Saruman, and manipulated Théoden, the king of Rohan, until Gandalf broke his control over him with his staff. He returned to Saruman afterward, and after the Ents destroyed most of Isengard they trapped Saruman and Wormtongue inside the tower of Orthanc. After the One Ring was destroyed, Treebeard let Saruman and Wormtongue go. They went to the Shire to cause mischief. Frodo offered Wormtongue the chance to leave Saruman, but Saruman pointed out that Wormtongue killed his cousin Lotho, and presumably ate him. When Saruman told Wormtongue to go with him, something snapped, and Wormtongue slit Saruman's throat with a knife, and was in turn killed by three hobbits with arrows.

In film
Wormtongue was once a man of Rohan, but betrayed them for Saruman, and they were manipulating Théoden, the king of Rohan. Eventually Saruman's control over Théoden was broken by Gandalf. Théoden tried to kill Wormtongue, but Aragorn stopped him, telling him enough blood has been spilt on Wormtongue's account. Wormtongue went back to Saruman as Isengard.

He was trapped in the tower of Orthanc along with Saruman when the Ents flooded Isengard. His final fate is only shown in the extended version, however; During Gandalf and Théoden's talk with Saruman, Wormtongue appeared and Théoden offered him the chance to go back to his side. Wormtongue wished to accept, in order to escape Saruman's beatings, but Saruman slapped him. As Saruman was about to reveal where Sauron was about to attack next, Wormtongue grabbed a knife and stabbed Saruman in the back, twice. In an attempt to stop him, Legolas shot Wormtongue with an arrow, killing him, but the damage was done; Saruman fell off Orthanc and was impaled by a spike.