Bonnie Somerville, last seen on NBC's In-Laws, will join the cast of NYPD Blue for its 12th and final season in the fall, according to The Hollywood Reporter. She's been handed the unenviable task of filling the void left by Charlotte Ross. And French kissing Dennis Franz. Meanwhile, a Blue source confirms that Ross' initial replacement, Jessalyn Gilsig, will not return. Draw your own conclusions.