Former Grey's Anatomy Star T.R. Knight Is Single

10/21/2009 at 05:05 PM EDT

Former Grey's Anatomy Star T.R. Knight Is Single
Mark Cornelson (right) and T.R. Knight
Stefanie Keenan/WireImage
T.R. Knight has split from Mark Cornelson, his boyfriend of two years, PEOPLE has confirmed.

"It's amicable," says a source of the breakup.

Don't expect the newly single actor, who departed Grey's Anatomy this spring after five seasons on the show, to be spending his nights nursing a broken heart at home: He'll be performing in Parade, his first musical, in Los Angeles through Nov. 15.

The split was first reported by In Touch.

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