Celebrity Mary-Louise Parker, Fiancé Break Off Engagement The split is latest for the on-again, off-again couple who began dating in 2006 By People Staff Published on April 8, 2008 09:00 PM Share Tweet Pin Email Photo: Chris Polk/WireImage 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. Parker adopted 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. Like this story? Click on the Yahoo Buzz! button below to Buzz it up!