Question: Okay, what's the real story behind T.R. Knight's probable exit? -- Claire
Ausiello: Another one of my Grey's moles just checked in. Let's ask him. "He's an actor. He wants to act. It's that simple." In other words, the 16 minutes of screen time he's had this season? Not cutting it.

Question: I'm devastated about T.R. Knight's Grey's Anatomy ( Read more... )

UPDATE!!!

The blogger who broke the story that TR Knight has walked off the set, has updated his blog. He now says that TR has quit. Here is the newest tidbit:

So, I got a little more information from my source and they say, "He hasn't attended table reads since episode 2. He is pissed and miserable and thinks his story line is stupid. He said ( Read more... )

Thanks to Sabrina from the ABC Message Boards for the heads up:

Details are emerging from the set of Grey's Anatomy that co star T. R. Knight has walked off the show. Knight has played Dr. George O' Malley since the shows conception in 2005.
More information to follow as it becomes available.

Source