Memory of a Killer, the new thriller featuring Grey's Anatomy star Patrick Dempsey, has added a major name to its cast.

Fox announced Tuesday that Michael Imperioli has been cast alongside Patrick Dempsey in the midseason drama "Memory of a Killer," adapted from the 2003 Belgian film.

Patrick Dempsey posted a rare family photo, celebrating his twin sons’ graduation from high school. His sons, Darby and Sullivan, attended Crossroads high school in Los Angeles.

Patrick Dempsey shared a rare photo of his and his wife Jillian Fink's 18-year-old twins, Sullivan and Darby, at their high school graduation.

Dempsey, 59, shared a rare photo of his twin sons Darby and Sullivan, who recently celebrated their 18th birthdays and graduated from high school.

Patrick Dempsey and his wife, Jillian Dempsey, celebrated their twin sons Darby and Sullivan's high school graduation May 30. See photos from their big day!

Patrick Dempsey posts rare photo of twin sons at graduation: ‘So proud of you boys' Dempsey attended the ceremony with his wife, Jillian Dempsey, and their daughter Talula.