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A fictional character on the primetime drama series 'Grey's Anatomy', played by actor Jeffrey Dean Morgan. He died as the fiance of Izzie Stevens in the season two finale of the series. Since then he has returned as a guest star.
Denny Duquette died, so why is he back on Grey's Anatomy as a ghost?

Izzie Stevens broke up with Denny Duquette.

Get away from me! Stop pulling a Denny Duquette!
by LBertrand October 09, 2009