Mark Cornelsen

T.R. Knight and boyfriend Mark Cornelsen are happy together - even living together. But they're not getting married - at least not yet.

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T. R. Knight (View All T. R. Knight Pictures)

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"Piece of My Heart"

Thursday, August 28, 9 p.m. (repeat, episode 4.13)

"The Becoming"

Thursday, September 4, 9 p.m. (repeat, episode 4.14)

"Untitled"

Thursday, September 25, 9 p.m. (NEW, 5.1)

Season 5 of Grey's Anatomy finally begins!