EXCLUSIVE: Elisabeth Rohm, who played Assistant DA Serena Southerlyn on NBC’s Law & Order, is taking on a other DA role, this time on the new CBS drama Stalker. Rohn will play a series regular on the Kevin Williamson series, which stars Dylan McDermott and Maggie Q as detectives from the Threat Assessment Unit who investigate cases of stalking. Rohm will play Amanda, a Los Angeles Deputy District Attorney who works with the Threat Assessment Unit and a mother to a 10-year-old boy, whose attempt at a new life in L.A. suddenly is derailed when she discovers her past (aka McDermott’s Jack Larsen) has followed her cross-country. The role was listed as a lead on the pilot’s breakdown, but the character only briefly appears in the pilot and ended up as a guest spot played by Elizabeth Bogush. Rohm, who co-starred in American Hustle, is with Mavrick Artists, Untitled, Hilary Shore and Felker, Toczek,.