No.
As Radagast is a very limited character in the original books, it is very hard to say for definite where he may have disappeared to, Tolkien never provided an ending to his story, but fans believe that he is still out there somewhere, disguised from human eyes like tree-herders, the ents, who have faded back into the ...
Each Wizard in the series had robes of a characteristic colour: white for Saruman (the chief and the most powerful of the five), grey for Gandalf, brown for Radagast, and sea-blue for the other two, who are known as the Blue Wizards (Ithryn Luin in Sindarin).
But Radagast was weaker and his role overshadowed by Gandalf's achievements. Therefore it is difficult to conclude whether or not Radagast failed. But it is clear that Tolkien had doubts following his criticism of him in the Istari essay and Radagast certainly did not fall into evil.
No Radagast the Brown does not die at any point in the books. Some people have speculated that at some point Saruman could have killed Radagast, but that's all it is: speculation. He drops out of The Lord of the Rings after being sent by Saruman to give a message to Gandalf.
As one of the most powerful beings in The Lord of the Rings, Radagast the Brown is one of the five wizards who came to Middle-earth on a mission to oppose Sauron and was a friend of Gandalf in the series.
Tolkien wrote about five wizards: Gandalf the Gray, Saruman the White, Radagast the Brown, and two unnamed Blue Wizards.
Luckily, Gandalf has the good sense to know that Radagast was an innocent player in the betrayal of the Saruman. He knew that Radagast had never intended to betray him: “He had concealed his mind and deceived his messenger. It would have been useless in any case to try to win over the honest Radagast to treachery.
It is unknown if Radagast left Middle-earth. J.R.R. Tolkien wrote that he forsook his mission as one of the Wizards by becoming too obsessed with animals and plants, so presumably failing, perhaps being disallowed to return to Valinor with honour.
The Blue Wizards Arrived First
The first Istari sent to Middle-earth to fight against Sauron are the two blue wizards named Alatar and Pallando. Alatar had been chosen by the Valar Orome, the hunter. Alatar didn't want to go alone, though, so he asked his friend Pallando to join him.
Unfinished Tales explains that Radagast, like the other Wizards, came from Valinor around the year 1000 of the Third Age of Middle-earth and was one of the angelic Maiar. His original name is said to have been Aiwendil, meaning bird-friend in Tolkien's invented language of Quenya.
Regardless, in The Hobbit movies, Radagast holds his own against Sauron's forces, despite not fighting as well as Gandalf. While Radagast's combat abilities never get revealed, it's likely that Peter Jackson's interpretation is somewhat correct, as Wizards were among the most powerful beings to walk Middle-earth.
Because of Saruman's slight distaste toward Hobbits in Jackson's films and Radagast's connection with woodland creatures, it's safe to assume the Stranger is likely not Saruman or Radagast. There is a slight possibility that the Stranger could be either Alatar or Pallando.
In JRR Tolkien's legendarium, what happened to the wizard Radagast the Brown after the War of the Ring and the departure of the ringbearers? Tolkien said that Radagast forsook Elves and Men, preferring the company of animals; he became a type of hermit who avoided people.
The Ring cannot effect Tom Bombadil because he is outside the whole issue of Power and Domination; Tolkien uses Tom as an allegory that even this intense struggle between "good and evil" is only part of the whole picture of existence. On this page you can find everything about the Rings of Power.
After doing what he can to save the wildlife, including his hedgehog friend, Sebastian, Radagast journeys to the source of the evil, Dol Guldur. There he is attacked by the Witch-king, a long-dead servant of Sauron.
The two, known as the "Blue Wizards", travel into the East of Middle-earth with Saruman. Saruman returns to the North West, but the two do not. Together or independent of each other, the two fall from their appointed task.
While Gandalf does reference the Blue Wizards during his travel with Bilbo Baggins and Thorin's company of dwarves, the studio didn't actually have the rights to Tolkien's Unfinished Tales of Númenor and Middle-earth and The Peoples of Middle-earth, where the Blue Wizards are featured, resulting in their absence from ...
In Saruman's view, Radagast was little more than some hedge witch; too concerned with feeding birds and living in some forest hovel, as opposed to a majestic, wise figure and master of magic like Saruman.
Gandalf the Grey
Even during this earlier part of his career, he still easily beats out Radagast and the Blue Wizards. For starters, the wanderer in grey clearly keeps his eyes on the prize throughout his tenure in Middle-earth.
In one of the most bewildering choices of the Hobbit films, Radagast is portrayed as a manic, filthy old coot with an actual bird's nest under his hat and a perpetual slick of bird poop down the side of his face. He goes about in a sled drawn at breakneck speed by large rabbits.
The Moth does not appear in the books, although it is possible that it indirectly appears, as Radagast the Brown says to Gandalf in The Fellowship of the Ring that he would send any messengers for help.
Again, this is very unlikely, because all the wizards — Radagast included — are said to have arrived during the Third Age. The Rings of Power takes place in the Second, ergo, not Radagast.
Though someone could start out with good intentions, the Ring would eventually corrupt them. And that is why Gandalf can't touch it. He is afraid that if he did, it would corrupt him and make him just as bad as Sauron since Sauron put so much of himself and his evil into the One Ring.
So with that in mind, let's dig in a bit. Certainly as Gandalf and Saruman, they had no contact with the 2 Blue Wizards and was not aware of what they were doing.