T.R. Knight as Wolfgang Amadeus Mozart.

The letter I, that is.

T.R. Knight is gone from Grey's Anatomy, but we will continue to hear big things from this actor in the future, without question.

T.R. Knight, from his recent Sesame Street appearance.

The Grey's Anatomy star talked with the famous talk show host in January 2007.

T.R. Knight has his "I" on the case as a private detective on Sesame Street.

T.R. Knight and Mark Cornelsen walk through New York in this photo from December 2008.

No, but it's T. R. Knight playing Mozart on stage!

Eric Dane and his wife, Rebecca Gayheart, hosted the Chrysalis Butterfly Ball over the weekend. They welcomed several of his fellow Grey's Anatomy cast members, such as the awesome T.R. Knight.

George O'Malley (T.R. Knight) is still an intern, having failed his boards in the final episode of Season 3. Now he's under the direction of Meredith Grey (Ellen Pompeo).

Knight, that is. Is he gone from Grey's Anatomy or not? We'll have to wait and see.

That's how we look at T.R.'s hair!