Mary-Louise Parker and Jeffrey Dean Morgan in December
04/08/2008 AT 09:00 PM EDT
Mary-Louise Parker and her Weeds
co-star Jeffrey Dean Morgan have broken off their engagement, PEOPLE confirms.
Parker, 43, who plays a pot-dealing mom on the Showtime series, and Morgan, 41, who plays her deceased husband (and Denny on Grey's Anatomy
), were engaged
earlier this year after a two-year on-again, off-again relationship.
Reps for Parker and Morgan declined to comment.
a baby girl last fall. She also has a son with actor Billy Crudup.
The breakoff of the engagement was first reported by the Associated Press.
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